Successful fire videos...

Today:  Please Be QUIET.  Exams are going on around us.

1.  Turn in report, slideshow, or movie (now or at end of class)

2.  Share your materials and method.  Tell us the following...

• What type of method did you use?
• Have you actually made true fire that is capable of igniting a marshmallow?
• What special tricks or important techniques did you discover?
• Other???

2.  Go outside and set up.  Don't start making fire until Mr. Stapleton says "Go!"

3.  Make fire, bask in warmth, and roast marshmallows.

4.  Put out fire and clean up.

When a long, rectangular box of wood is placed on some water, how will it orient itself?  See choices below.

Today:  

• Problem: density of plumber's putty?? Find the density of plumbers' putty using water, liquid measurement containers, and plumbers' putty.
• Project work time

Midterm Preparation: 

1. Finish your project
2. Wear appropriate clothes.  Be able to stand outside for over an hour.
3. Thoroughly think through the situation.  Bring everything you may need.  Don't forget stuff!

1. What do we know about the density of the iceberg?
2. Why do people draw streams of bubbles that get bigger closer to the surface?
3. What will happen to the water level in the lake if the iceberg melts completely?  Why?

Today:  

• Work on fire-making process.

Homework:  Work on midterm project.

1. What's the easiest way to "pop" your ears when you're descending in an airplane?
2. What's the easiest way to "pop" your ears when you're ascending in an airplane?
3. How do these methods work?

Eustachian tube

Today:  

• Midterm Project Guidelines and Rubric.
• Work on pressure notes (finished in B1, got to #11 in B2)
• Do you need me to bring anything on Tuesday?
• Extra credit for dressing like stone age humans?

Homework:  Gather project materials for work time on Tuesday.

The Bathyscaphe Trieste is the only manned vessel to have reached the deepest part of the ocean.

1. Where is the deepest part of the ocean?
2. How deep is it?
3. Geologically speaking, why is that part of the ocean so deep?
4. What are the dangers of traveling that deep?

Today:  

• Questions about midterm project? 
• Share compilation of Feedback.
• Introduction to fluids and pressure.

Homework:  None

What are the primary difficulties in using friction to create fire?

Today:   Review outline of midterm project.  Choose groups.  Begin research.

Midterm Project:  Fire from friction

1. Research methods of creating fire by using friction.
2. Choose a method and begin experimenting outside of class.  Refine your materials and method.  In addition to today, you will have at least one day to work on this in the classroom.  The rest of the work should be done outside of class.
3. Describe your final, perfected materials and methods.  Use diagrams and/or photos.
4. Explain the reasoning behind each of the components of your fire-making method.  Share not only the scientific underpinnings of your method, but also your process of discovery.  Why did you choose the precise method that you chose?  What led you to each of its parts?
5. Analyze the efficiency of your final method.  How much energy do you have to expend to produce smoke?  How about a "coal?"   Explain your calculations.
6. Exam Day:  Turn-in a report, video, or slideshow covering #3-5, above.  Briefly share your method with the class, create fire, and roast marshmallows. 
7. A group cannot receive an A+ without creating a flame capable of igniting a marshmallow.  Smoke is a requirement for an A-.  The first three groups to create a true marshmallow-ignition-capable flame receive 3, 2, and 1% bonus points, respectively.

Restrictions:

• Fire must be created by mechanical means.  During the fire starting procedure, no non-mechanical energy (other than energy from your ingested food)  may be used to raise the temperature of the fuel to its ignition point.

• Fire making apparatuses must be made "from scratch."  Pre-made pulleys and gears may be used, but pre-made assemblages of pulleys and/or gears are forbidden.

Possible Extra Points For:

• Unique mechanical transformations – gears, pulleys, levers, etc.
• Use of primitive materials
• Extreme efficacy

Midterm Dates:  Blue 1-- Jan 18th; Blue 2 -- Jan 19th

Homework:  Begin preparation for midterm project.

Today: Test

Homework:  None

1. Prepare your car.
2. Make sure that your car will be easily identifiable in its video.
3. Gather repair materials.
4. Finish Activities -- due today.

Homework: 

1. Test next class -- just like the 2009 test, but with different "givens."  Practice using the interactive version.
2. Individual short essay due next class (or before 2:00 on Wednesday)-- "What I learned from this project" or "What I would do differently..." -- or something else along those lines.  This should be about 1 page, typed.  Longer is okay, but not required.

1. For contest purposes, speed will be calculated by time to pass a row of tiles.  No adjustments will be made for cars that do not travel orthogonally.  Thus, cars that go straight will be rewarded -- as will groups who know how to compensate for their cars' veering. [For grading purposes, top speed calculations can take veering into account.]
2. Cars will get three attempts.  A video will be made of each attempt.  Each group must examine its own videos.  The group should identify the file name of the video showing its floor tile interval of top speed, as well as the relevant span of frame numbers within the video.  The group must then present this information to Mr. Stapleton for corroboration.

Upcoming Events/Assignments/Deadlines:  

1. Car contest Next Class. 
2. Car activities due Next Class -- Turn in activity data in some organized fashion.  You can either e-mail it all or print it all.
3. Test next Tuesday, 12/21 -- just like the 2009 test, but with different "givens."
4. Individual short essay -- "What I learned from this project" or "What I would do differently..." -- or something else along those lines -- due on 12/21.  This should be about 1 page, typed.  Longer is okay, but not required.

Homework:  Prepare to meet the deadlines above.

How do bearings work?

As the outer circle in the diagram moves, it seems that the outside of each bearing will "travel farther" than the inside of the bearing.  Is that a problem?

Today:

• New spreadsheet -- friction calculator + moment of inertia calculation
• Salvage parts from launchers.
• Work on 2-J Car Activities

Upcoming Events/Assignments/Deadlines:  

1. Car contest Friday. 
2. Car activities due on Friday.
3. Test next Tuesday, 12/21 -- just like the 2009 test, but with different "givens."
4. Individual short essay -- "What I learned from this project" or "What I would do differently..." -- or something else along those lines -- due on 12/21.  This should be about 1 page, typed.  Longer is okay, but not required.

Homework:  Prepare to meet the deadlines above.

What is the difference between a 2-stroke engine and a 4-stroke engine?

Today:

• Salvage parts from launchers.
• Work on 2-J Car Activities

Upcoming Events/Assignments/Deadlines:  

1. Car contest next Friday. 
2. Car activities due next Friday.
3. Test on Tuesday, 12/21 -- just like the 2009 test, but with different "givens."
4. Individual short essay -- "What I learned from this project" or "What I would do differently..." -- or something else along those lines -- due on 12/21.  This should be about 1 page, typed.  Longer is okay, but not required.

Homework:  Prepare to meet the deadlines above.

Today:

• Video Cars
• Begin Analysis -- here's a spreadsheet that you can use as a starting point.
• Friction calculator

Homework:

1. What's the name of the object represented by the smallest semicircle?
2. Why won't anybody see it there in a few thousand years?
3. How does this relate to this class?

Today:

• Quiz
• Finish cars
• Begin analysis

Homework:

• Your car must be "finished" before next Tuesday's class.  It must travel on its own a distance of at least 5 meters using stored mechanical energy.
• Test on the Wednesday (Wed, 12/15) after next. 

This is the front axle of a mousetrap-powered car.  This axle causes the car to curve.

1. Which way does it curve?
2. What's the easiest way you can think of to fix it well?

Today:

• Check for homework completion.  Questions relating to the homework problems???
• Work on Cars -- cars must be complete before next Tuesday's class.  Most groups should finish them before the end of next class.

Homework:

• Study for quiz.  Quiz next class over questions 14-20 from the last year's test.  Questions will come directly from this file: 2009 Rotational Motion Test With Solutions -- Interactive Version.  The "givens" will be altered.  The interactive test should provide good practice.
• Make sure that your car is "finished" before next Tuesday's class.  It must travel on its own a distance of at least 5 meters using stored mechanical energy.
• Test on the Wednesday (Wed, 12/15) after next. 

Play with one of the fancy yoyos.  The package says it has a special, patented clutch. 

1. Try to figure out what the clutch is supposed to do, and how it works.
2. Forget about rotational KE for the moment.  Sketch a graph of the yoyo's KE_{translational} versus Height -- for one down/up cycle.

Today:

• Extra credit problem?
• CAD option?
• Work on cars.

Homework:

• Answer questions #11-18 and 20-22 on last years test p. 16 (back of p.15)  2009 Rotational Motion Test With Solutions -- Interactive Version
• Video solutions to Test [please excuse the hands]:  #1-2, 3-4,6-7,8, 9, 10, 11-13, 14-16,17, 18, 19, 20, 21, 22  Click here for the test shown in the videos.

The contraption below comprises two records connected by a metal bar.  A string is wrapped around the bar.  At one end, the string is tied snugly to the bar .  At the other end, the string is tied to a small but heavy weight.  What will happen when the contraption is released on a smooth, hard, level surface of unlimited size?

Today:

• Check/review homework -- Qs 6-7 from p.15.
• Work on cars.

Homework:

• No homework

Suppose you want to measure the amount of work done in "winding up" this mouse trap powered car.  Would it matter where the string was tied along the metal arm?  Explain.

Today:

• Check/review homework -- Qs 1-5, 19 (from p. 15-16) and car design assignment. 
• Another practice problem -- a second way to find a ring's I.
• Begin building cars.  Next class -- review homework and work on cars.

Homework:

• P. 15, # 6-11 [**For #6 & 7, assume the disc has a mass of 2kg**].  Work on the problems and check your work using the solutions on the Physics II "handouts" page of this website.
• Find car materials.  Bring them to next class.

You can think of a radian in two ways:  you can think of it as an angle (about 57.3degrees) or an arc on the edge of a circle (that arc having a length is equal to the radius of the circle).

1. If a wheel rolls through 6 rotations, through how many radians does it rotate?
2. A wheel has a radius of 0.5m.  As the wheel rotates, a point on its edge has a speed of 20m/s.  What is the rotational velocity of the wheel, in radians/second?

Today:

• Rotational Motion Practice Problems  [Solutions to Practice Problems (corresponding to the practice problems in handout 1, as well as an entirely new practice problem relating to a ring rolling down a ramp)]
• Rotational Motion Activity (Essentially, do 1-7 on p.15 -- but with real items).
• Work on car design assignment.

Homework:

• Complete the following questions from last year's test (p. 15-16): 1-7, and 19.)
• Car design assignment due on Tuesday (11/16)

Warm-Up:

Today: 55 minute class

• Check for homework; go over answers. Click here for solutions.
• Extra credit problem solution -- mass of the bar.
• Work on car design assignment.

Homework:

• Car design assignment due on Tuesday (11/16)

Why do partially used toilet paper rolls wind up on the table in the math/science office?

Today:

• Predicting the flight distances of spheres rolling down a ramp and flying through the air.
• Torque Problems
• Torque Challenge

Homework:

• Finish #1 on p. 13,14 (parts e-h)
• Complete #8-10 on 2009 rotational motion test (handout p. 15).  For #8, assume that the "operator" applies an 80N force to the "big crank."

11/4

• Turn in launcher activities stuff
• Contest

11/2

• Return Tests (answers are available)
• Check Grades -- if there are corrections to be made, write a note on the grade report and turn it in to the in box.
• Finish Launcher Activities

Launcher Project Info:

• Launcher Activities Due Next Class (except for parts 1 and 2 -- relating to precision and accuracy).  Turn in by e-mail or in print form.
• Contest Next Class.  Be prepared to show up in the classroom and quickly move to the main foyer or the gym.
• Contest Details -- In addition to the previously provided details:  1) For both contests, you should be be prepared to shoot from the floor.  2) Since the contest will not take place in the classroom, you will not be able to use a computer during the contest.
• Extra Credit for top Finishers (out of both Physics II classes, combined):  2% for 1st and 2nd Place.  1% for 3rd and 4th.

Grade Info:

• If you would like to have any of your quiz grades replaced with your test grade, write a note on the grade report specifying which quiz.  Put the note in the in-box.
• Tests and quizzes account for approximately 50% of your grade.  That percentage will not change significantly when the launcher activities are factored in.

10/27

You are standing beside a gymnasium.  You throw a 0.1kg ball at a 65 degree angle, so that it lands on the gym roof.  The gym has a flat roof that is 25m higher than the point from which you release the ball.  The ball's velocity just after you release it is 30m/s.

1. What is the ball's initial kinetic energy?
2. What is the ball's kinetic energy when it lands on the roof?
3. At what angle does the ball collide with the roof?

Before The End of The Quarter...

• Vo extra credit due now.
• Finish Launcher Activities and Prepare for Contest (Today, Tuesday, and/or outside of regular class time) -- When you're in the hall, remember that other classes are going on.
• Study session Thursday, after school in E205 (here).
• Test (Next Class -- Friday)
• Launcher Contest (Next Thursday)

Homework:

• Study. 

10/25

Your launcher flings a projectile at a 40 degree angle from a point that is 0.3m above the ground.  If the projectile travels a horizontal distance of 5 meters, what was its initial speed?

Today:

• Check status of launchers.
• Work on Launcher Activities

Upcoming Classes:

• Test Friday.  Launcher contest on Tuesday.
• For test: questions will be similar in content to those on handout #3 (Handout 3:  Practice/Review Questions) and the bungee quiz (solutions to the bungee quiz.)

Homework:

• Study.  **Study session on Thursday afternoon in E205**
• Find a way to complete launcher activities before Tuesday.  Work days today and Wednesday.
• 1% extra credit for an equation for Vo in terms of height, horizontal distance, and release angle.

10/19/10

Figure out the pattern of the first four progressions.  Then figure out the progression that begins with 17.

6, 3, 5, 4

8, 5, 4

1, 3, 5, 4

9, 4

17, ???????

Today:

• Return Quizzes
• Work on launchers.
• Launcher Activities

Upcoming Classes:

• Have your launcher finished before the beginning of next class on Monday, 10/25.  Then begin launcher calibration and activities (force and work graphs, velocity graph, release height and angle...?)
• Projectiles Test on Friday, 10/29.  Study all handouts.  Link to handouts page.  The best sources of problems like those on the test are #3, 4, and 7, on handouts page.

Homework:

• Finish your launcher.

10/15/10

This is called a "floating arm trebuchet."  Can you guess how it works? Link to "Moustache Revolution" floating arm trebuchet video.

Today:

• Quiz: monkey and wall impact problems.
• Work on launchers.
• There is now a link to the solutions to the bungee quiz.

Upcoming Classes:

• Have your launcher finished before the beginning of class on Monday, 10/25.  Then begin launcher calibration and activities (force and work graphs, velocity graph, release height and angle...?)
• Projectiles Test on Friday, 10/29.

Homework:

• It's up to you.

10/13/10

Assuming that enough energy can be provided in either case, is it better to power a projectile launcher with more rubber bands or fewer rubber bands?  Why?

Today:

• Return Quizzes
• Blue 2: check drawings
• Sphere update:  20 "chromium steel," 5/8" diameter spheres are on their way.
• Work on projectile launchers.

Homework:

• Next class: quiz and work time -- Click this link to Excel file with practice problems and explanations.  The quiz will have exactly the same questions, but the "givens" will change.  On the quiz, you will only be asked to provide answers to the numbered parts (numbers in column A).  You will not be prompted to provide the other information in the spreadsheet, so you will have to know what to do in order to arrive at the answers to those numbered parts.  If you don't have Microsoft Office, you should be able to use this spreadsheet by downloading Open Office at www.openoffice.org.

10/11/10

When enough of the sand flows to the bottom of the hourglass, the hourglass will float to the top.  Why?

Today:

• Short Quiz.
• Sphere update:  20 "chromium steel," 5/8" diameter spheres are on their way.
• Construct/calibrate projectile launchers.

Homework:

• Blue 2 Only:  due on Wednesday:  Design a launcher that will accurately and precisely fling small projectiles from one classroom tabletop to another.  Maximum distances and heights are governed by the tables and ceiling height.  Projectiles will be marble-sized.  For competition, the steel spheres will be used.  Launchers should be calibrated for a variety of distances.  Incorporate means for achieving maximum accuracy, precision, and ease of operation.  Sketch diagrams of your launcher design from at least two different perspectives.  On at least one of your diagrams, label the materials you plan to use.  Bring these diagrams to our next class.

1. Describe how to bounce someone really high on a trampoline.  Why does your method work?
2. What could be done to make this catapult more accurate? More precise?

Today:

• Finish reviewing the homework problems that were due last class.
• Please forgive me, but I have come up with another way to determine the work done on a jumped bungee.
• Hand out sheet of formulas and hints
• Work on projectile launchers.

Homework:

• Quiz next class.  Be able to do #3-7 on "Bungee Problems" handout p. 9-10. 
• Next Class: Bring materials to begin assembling/calibrating launchers

1.  Why didn't the "bungee jumpers" fall as far as expected? 

2.  How could the actual fall distances have been more accurately predicted?

3.  Look at the trebuchet on the right. Suppose you made a graph of "force to pull arm back" vs θ.  What would the graph look like for values of θ between 0 and 90 degrees?

Today:   40 Minute Class

• Check homework problems. (7c, 9-12, and "one more problem").  Which ones are giving you the most difficulty? solution to "one more problem."
• More bungee jumps? 

Homework:

• Gather/prepare materials for launchers launchers.  We will finish going over problems, and then you will have work time to assemble and begin calibrating your launchers.
• Launcher Materials Provided:  wood strips, hot glue, big nails, drill/drill bits, wire, rubber bands, cardboard, ?.  If there's something else in this room that you would like to use, ask first.

A 100 kg bungee jumper jumps off of a bridge and free-falls until his bungee begins to stretch.  The bungee begins stretching at a point 10m below the bridge.  After his bungee begins to stretch, the jumper falls another 40 meters before reaching his low point.  On his first bounce, he returns to a point 20m below the bridge. 

1. Approximately how much work did the jumper do on the bungee in the process of stretching it to her low point?
2. On his return bounce, the jumper did not get back all of his original potential energy.  This means that the bungee was not 100% efficient in returning the jumper's energy.  What was the % efficiency of the bungee?  [efficiency = E_out / E_in].
3. If a projectile has an x velocity of 11m/s and a y velocity of 15m/s, at what angle is the projectile's velocity inclined to horizontal?  What if v_x = 3m/s and v_y=1.9m/s?

(answers: 50,000j; 60%; 54.7 degrees; 32.3 degrees)

Today:

• Bow efficiency.  Arrow velocity = 37m/s; Arrow mass = 0.098kg; Arrow KE = 67j.
• Blue 2: check homework problem
• Continue Bungee Challenge -- hold contest.
• Check launcher design diagrams (2 diagrams, different perspectives, materials labeled)
• Plan to create launchers.
• Work time (practice problems, launcher design...)

Homework:

1. Complete practice/review problems #9-12, and give the complete answers to #7c [In # 7c, you already gave the magnitudes of the projectile velocities; now describe their directions.].
2. One more problem:  A 0.04kg projectile is fired at a 25 degree angle, relative to horizontal.  It is launched from a horizontal, frictionless surface with an initial speed of 40m/s.  After 2.5 seconds of frictionless flight, the projectile hits a vertical wall.  At the moment of impact... a) what are the x and y displacements of the projectile, relative to its starting point? b) what are the projectile's x and y velocities?  c) at what acute angle does the projectile strike the wall? d) what are the projectile's PE, KE, and total Energy?
3. Next class:

1. How much work is required to pull the bowstring (graph on right) back a distance of 0.4m?
2. If the bow is 50% efficient, how much kinetic energy will the arrow have immediately after release?
3. If the arrow has a mass of 30g, fast will it travel?

Today:

• Hire outbox people
• A remembrance: why the bow is no longer set for frogs.
• Efficiency of the bow.
• Blue 1 -- check bungee graphs.  Bungee activity and contest.  Launcher design time?
• Pre-made bungee spreadsheet -- just replace the yellow data with your data.  Add more rows if necessary.  Save in your folder for future use.
• Blue 2 -- force, work, and bungees.  Prepare for contest.
• Here are the solutions to the "bungee problems" handout (p.9-10). 

Homework:

1. Blue 1 Only:  due on Friday:  Design a launcher that will accurately and precisely fling small projectiles from one classroom tabletop to another.  Maximum distances and heights are governed by the tables and ceiling height.  Projectiles will be marble-sized.  For competition, the steel spheres will be used.  Launchers should be calibrated for a variety of distances.  Incorporate means for achieving maximum accuracy, precision, and ease of operation.  Sketch diagrams of your launcher design from at least two different perspectives.  On at least one of your diagrams, label the materials you plan to use.  Bring these diagrams to our next class.
2. Blue 2 Only:  Use the data in this spreadsheet to answer the following question... You must drop a "jumper" from 0.1m above the "zero stretch point" of the bungee.  If you want the jumper to stretch the bungee 1m before coming to stop, how much mass should the jumper have?  Hint:  the only part of the spreadsheet that you really need to look at is the work vs. stretch graph (tab at bottom).
3. Both Classes -- Due next Tuesday:  Complete practice/review problems #9-12, and give the complete answers to #7c [In # 7c, you already gave the magnitudes of the projectile velocities; now describe their directions.].
4. If you're interested, the extra credit problem is due by the beginning of class on Friday.

If you pull back the arrow in the diagram below, you will have to use a strong force at first, but then the force required decreases.  Why?

Today:

• Finish reviewing practice problems
• questions about the extra credit problem?
• Bungee Problems
• Activity -- create bungees, create graphs of work vs stretch distance, practice for a bungee jump contest next class.

Homework:

• Blue 1 -- complete graph of work vs. stretch distance
• Blue 2 -- no homework

What would happen if you made a hole through the center of the Earth, and you jumped in?  If you came out the other side, where would you be? (antipodes map)

"hyperphysics" link

Today:

• New, improved ballistic pendulum -- re-determine potato velocity.  Confirm with slow motion camera.
• Ideas regarding rocket height measurement
• Extra credit opportunities
• ≥ 45 minutes of work time:  ballistic pendulum, homework
• Turn-in ballistic pendulum info; fill out this data sheet for your group.
• Review homework.  Here are some solutions to the homework problems  I wrote out these solutions last year.  I think I can explain them a little more clearly now.  We will go over them in class.

Homework:

• See reading below (from 9/17).  Next class, we will be working on a bungee jump problem.  It will be similar to example 6-25, in the book (p.165).  But it will be a little more complex, because our bungees will be made of rubber bands, and rubber bands don't really have a spring constant.  In other words, the graph of stretching force vs. distance stretched is not linear, as it is with the ideal spring of example 6-25.

Today:

• Contest -- who were the other team members?  How to solve?
• Questions about Excel Assignment?
• Activity:  measuring velocity with a ballistic pendulum.
• Work time:  Excel or review questions.

Homework:

• Excel assignment due today -- e-mail file to Mr. S.  See me if you'll have trouble meeting this deadline. 
• ** Review questions 1-8.

• Meet in library to work on Excel spreadsheets -- 45 minutes.
• Return to classroom for contest
• If time -- Consider Launcher Designs

Homework:

• Work on Excel assignment at home (Due by Tuesday, 9/21 -- e-mail file to Mr. S.) 
• Review Textbook Sections 6-3 through 6-7, 7-4, and 7-6.  Pay close attention to the following "Examples:" 6-8 (p.160); 6-9 (p.161); and 7-9 (p.190). 
• We won't start on this for a while, but you might want to start thinking about it...  Design and build a launcher that will accurately and precisely fling projectiles from one classroom tabletop to another.  Maximum distances and heights are governed by the tables and ceiling height.  Projectiles will be marble-sized.  For competition, the steel spheres will be used.  Launchers should be calibrated for a variety of distances.

Today:

• Return/review Quizzes
• Shooting contest after ______  minutes prep time.
• Intro to Excel (library work time next class). 
• Discuss -- "Trick shot" sooner or later?

Homework:

• Work on Excel assignment at home (Due by Tuesday, 9/21-- e-mail file to Mr. S.)  ** Next class, meet in the library computer lab for Excel troubleshooting.***  We will return to the classroom after library time.
• Plan a strategy for "Siege Contest."   Here's a link to the contest details.  The contest will take place on Friday, after library time.  10 minutes practice time (shooting allowed); 10 minutes planning (no shooting). 1st place -- 3% extra credit on 1st test.  2nd place -- 2%.  3rd place -- 1%.

1. A projectile is launched directly upward.  It reaches its apogee at 1.6m.  What is it's initial velocity?
2. Another projectile is launched at a 20 degree angle (relative to horizontal).  Its initial muzzle speed is 8m/s.  How far, horizontally, will the projectile travel while it remains in the air?
3. Will the "hunter" hit the "monkey" this time (see set-up in front of room)? spreadsheet

Today:

• course expectations parent signature due
• sit where you want
• Short Quiz
• Shooting contest -- with a new twist.

Homework:

• Generate ideas for a "trick shot" during an upcoming class (Friday -- probably).  Working in groups, you will attempt a "trick shot" of some sort.  The shot will be captured in slow motion video.  You will be expected to explain your intentions and your methods.

Today:

• Inspiration v/s coverage
• Finish example problems B and C.
• Complete lab portion of  Projectile Motion review. 
• Shooting contest

Homework:

• ** Very short quiz next class to check for understanding.  For homework, practice the problems on this practice page.  For the quiz, you will have to determine the horizontal distance traveled by a projectile fired at a given angle from a projectile launcher that launches projectiles to a given height when fired vertically.
• ** Get course expectations parent signature by Monday, 9/13.

Spin one of the "sprotating cylinders" by pressing one end until it squirts out from under your finger. 

Can you explain the phenomenon that you observe?

Today:

• Learn names; fill out info sheets
• Short video
• Get textbooks.
• Go over course expectations
• Begin Projectile Motion review.  Here's some help with the solutions to A, B, and C.  I hope to revise this soon, to make it a little clearer.

Homework:

• Helpful pages in the book: kinematics formulas - p. 28; Component vectors - p. 52-53; Projectile motion - p 59; Trig functions - p 1045
• ** Get course expectations parent signature by Monday, 9/13.