Warm Up: 

Warm Up: 

1.  What does a weather vane do?  How does it work?

2.  How does a water rocket work? Video of a Water Rocket Launch

Warm Up:  We have a very precise digital scale.

Warm Up:  According to Newton's 3rd Law, every force has an equal and opposite force.  So how do you win a game of tug-of-war?

Today:

• Decide whether or not to drop the quizzes.
• Newton's 3rd Law Notes
• Finish the Newton Sled Activity
• Unit 2 handout (PDF) Answers
• If there's time... Newton's 2nd law problems -- maybe experiment with the force plate

Until Next Class: 

• None

Warm Up:  Is it literally possible to "pull yourself up by your own bootstraps?"  Put another way, can you pick yourself up?  Explain.

Today:

• Retake -- test page 4 -- kinematics problems
• Continue Unit 2:  Forces  Unit 2 handout (PDF) Answers.  Begin at Newton's 3rd Law.
• Start the Newton Sled Activity

Until Next Class: 

• None

Warm Up: What will happen if I poke a knife through a potato, hold both objects in the air with the knife pointing downward, and then hammer the butt of the knife into the potato?  Why?  What if it's an apple, because I didn't have potatoes?  What can I use if I forgot any fruit or vegetables?

Today:

• Return Tests
  • go over answers and check for grading errors
  • Do some more practice problems like page 4 -- unless your score was 13.5 or better on page 4, there is an required retake next class.  Make a Video.
• Videos to help you prepare for retaking the test are in the class YouTube playlist.  You can retake pages 1,2 or 3 during FLEX or before school, beginning next week.
• Let's wait to look at dropping quiz grades until after next class.
• Continue Unit 2:  Forces  Unit 2 handout (PDF) Answers.  Begin at Newton's 3rd Law.

Until Next Class: 

• Page 4 retake next class.  Practice.  Solve the test questions while covering your work.  Try the practice questions from class -- hopefully I made a video.

Warm Up: It is possible to remove a sheet paper from under a dry erase pen without touching or tipping the pen.  How can one do this without tipping the pen?  Why does the pen usually fall? 

Today:

• Test
• Begin Unit 2:  Forces  Unit 2 handout (PDF) Answers -- we stopped just before Newton's 3rd Law.

Until Next Class: 

• Have a great weekend!

Warm Up: There is a heavy object suspended from the ceiling by a string.  Another segment of the same string is hanging downward from the object.  I am going to pull on the bottom string until one of the two strings breaks.  Which string is going to break first?  Why?

Today:

• Quiz -- Using Motion Formulas -- the video is in the class video playlist
• Final practice -- what's on the test.  See the review at the back of the handout...  Unit 1 (Motion) Handout (PDF) 
• Videos from the test review are in the class video playlist
• Begin Unit 2:  Forces  Unit 2 handout (PDF) Answers

Until Next Class: 

• Study -- Unit 1 (Motion) Test on Wednesday

Warm Up: 

Consider the case of this ball.  At t = 0s, the ball is flying directly upward at a height of 0m, with a speed of 20m/s.  Sketch graphs of the ball's position, velocity, and acceleration (vs. time) over the next 4 seconds. 

Let's assume that there is no air resistance and that g = 10m/s².

Today:

• Quiz retake?
• Return Quizzes
• Practice with problems -- using kinematics formulas -- get a video  part 1 part 2
• Make a formula list?
• Test will be next Wednesday. -- not Monday.
• There will be a quiz on Monday over problems with motion formulas -- and possibly other things that you want to work on.

Until Next Class: 

• Study -- Quiz on Monday

Warm Up: Let's find the g-forces that it experienced as it got faster than then as it slowed down.  [This is one of your graphs.  Does anyone recognize it?]

1.  How many g's is safe for humans?

2.  Estimate the maximum positive slope, in m/s² (max positive acceleration)

3.  Estimate the maximum negative slope, in m/s².

4.  Convert these accelerations to g's by dividing them by 1g (9.8m/s²)

Warm Up: Let's talk about "free-fall" so we can discuss g's of spool car acceleration later on.  1g = 9.8m/s², but for this exercise, let's round it to 10m/s². 

Today:

• Practice Quiz -- Calculating Acceleration from a Position vs Time Graph (PDF)  Video from class
• Create position and acceleration graphs of spool cars from videos.  Compare their accelerations to gravity.
• We're done with new stuff!  We can have a test soon (and move on to forces)!  Start the review and practice problems on p. 11-12

Until Next Class: 

• Next class:  quiz like today's practice quiz

Warm Up:   We're going to use this position vs time graph to find acceleration of the moving object.

1. What is the object's displacement between 0s and 1s?

2.  What is the object's velocity between 0s and 1s?

3.  What is the object's displacement between 1s and 2s?

4.  What is the object's velocity between 1s and 2s?

5.  What is the object's displacement between 2s and 3s?

6.  What is the object's velocity between 2s and 3s?

7.  What is the acceleration of the object?

Until Next Class: 

• Practice quiz next class -- finding acceleration from a position graph (like p. 9) and a velocity graph (like the spool car graphs)

Warm Up:   Complete the warm-up -- motion combinations practice in Google Classroom.

Today:

• Quiz.  Video going over quiz solutions.
• Today's Goal: Practice using video analysis to create graphs of position and velocity, vs time. 
• Get a video of your spool car crashing into the wall with the highest possible force.  We will find both the acceleration and deceleration.

Until Next Class: 

• If you want to retake today's quiz, ask for it before class starts on Wednesday.

Warm Up:   I want to demontrate the types of motion on the right, using a cart on a track.  I can tilt the track using books.  How can I do each of these?  Which ones are hardest?  Let's assume for this activity that left is negative and right is positive.

Today:

• Finish notes on pages 7-8
• Unit 1 (Motion) Handout (PDF)
• Short Practice Quiz:
  • Part 1: Group these graphs into 5 groups of 3 that each represent the same motion.
  • Part 2:
    • Calculate the acceleration of a car whose velocity changes from 80m/s to 60m/s in a time of 4 seconds.

Until Next Class: 

• Quiz next class -- like the practice quiz

Warm Up:  

1. moving at a constant speed
2. moving toward the sensor
3. not moving at all
4. accelerating
5. decelerating
6. accelerating the fastest
7. moving at the fastest constant speed

Today:

• Return and review quizzes.
• Notes: p.5 through the top of p.6 (acceleration) Video
• Quiz Retake for anyone who wants it -- Distance, Displacement, Change in Time, Speed, Average Velocity (both formulas) -- or short break
• Notes: p. 6, and 8 (acceleration and motion graphs) Video
• Can we get to p. 9??
• Today's New Learning Targets are in cyan

  VM.x -  I can draw and interpret diagrams to represent the motion of an object moving with a constant velocity

  CVM.x -  I can solve constant velocity problems

  CAM.x -  I can draw and interpret diagrams to represent the motion of an object moving with changing velocity

  CAM.x -  I can solve constant acceleration problems.

  CAM.x -  I can solve kinematic equations

Until Next Class: 

• Practice Quiz next class -- similar to handout page 6 and 8.
• Next class -- probably measuring spool car accelerations
• Class after next -- 2nd quiz

Warm Up:  

1.  On the velocity vs. time graph, find v₀, v, and average v.

2.  On the position vs. time graph, find: total displacement, total distance, average velocity, maximum speed, and minimum speed.

3.  Let's do some more practice to get ready for the quiz.

Warm Up:  

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

When the cylinder is spinning, why do you only see the symbol that you press?

Slow motion

Warm Up:   How do dragsters go so fast?