• 5th
• Chapter 5 Review due
• 6th/7th
• Chapter 5 Review due
• *Car Collisions: It's basic physics

Wednesday, December 12

• 5th
• Chapter 5 Test
• 6th/7th
• Chapter 5 Test
• *Finish Car Collision video
• Intro. to My Car's Safety project

Thursday, December 13 – No school – Snow day

Friday, December 14

• 5th/6th
• Conservation of Energy Lab due
• Car Collisions: It's basic physics
• Intro. to My Car's Safety
• *Defining momentum and impulse
• Some example problems
• 7th
• Conservation of Energy Lab due
• *Defining momentum and impulse
• some example problems

Monday, December 17

• 5th
• Chapter 6 Example Problems
• 6th
• Chapter 6 Example Problems

Tuesday, December 18

• 5th
• P. 181, 1-6 due
• Questions? Hand in homework
• High speed videography examples
• *Finish example problems
• 6th/7th
• P. 181, 1-6 due
• Questions? Hand in homework
• High speed videography examples
• *Law of Conservation of Energy
• Difference between elastic and inelastic collisions
• Intro. to Ballistic Pendulum Lab

Wednesday, December 19

• 5th
• My Car's Safety due
• Law of Conservation of Momentum
• Difference between elastic and inelastic collisions
• 6th/7th
• My Car's Safety due
• Collision example problems
  • A 1.2 kg snowball moving at 18 m/s strikes a 0.70 kg top hat on a snowman. They stick upon colliding. Calculate the final speed of the hat and snowball.
  • A 53 kg boy runs at a velocity of 6.5 m/s and jumps on a skateboard with a mass of 2.5 kg that is already moving at 3.0 m/s. What is the combined speed of the boy and skateboard?
  • An 8.1 kg rifle fires a bullet with a mass of 0.011 g at a velocity of 450 m/s. What speed does the rifle move backward? Compare the kinetic energies of the rifle and the bullet.
  • A tennis ball with a mass of 0.13 kg moves toward a player at a speed of 35 m/s. The player makes the 1.8 kg racquet move at 51 m/s toward the ball and the racquet slows to a speed of 45 m/s. What is the final speed of the ball?
• *Ballistic Pendulum lab

Thursday, December 20

• 5th/6th
• P. 182, 8-13 due
• Go over problems
• *Intro. to ballistic pendulum lab
• Train crashes
• 7th
• P. 182, 8-13 due
• Go over problems
• A tennis ball with a mass of 0.13 kg moves toward a player at a speed of 35 m/s. The player makes the 1.8 kg racquet move at 51 m/s toward the ball and the racquet slows to a speed of 45 m/s. What is the final speed of the ball?

Friday, December 21

• 5th/6th
• Collision example problems
  • A 1.2 kg snowball moving at 18 m/s strikes a 0.70 kg top hat on a snowman. They stick upon colliding. Calculate the final speed of the hat and snowball.
  • A 53 kg boy runs at a velocity of 6.5 m/s and jumps on a skateboard with a mass of 2.5 kg that is already moving at 3.0 m/s. What is the combined speed of the boy and skateboard?
  • An 8.1 kg rifle fires a bullet with a mass of 0.011 g at a velocity of 450 m/s. What speed does the rifle move backward? Compare the kinetic energies of the rifle and the bullet.
  • A tennis ball with a mass of 0.13 kg moves toward a player at a speed of 35 m/s. The player makes the 1.8 kg racquet move at 51 m/s toward the ball and the racquet slows to a speed of 45 m/s. What is the final speed of the ball?
• *Go over My Car's Safety results
• 7th
• Go over My Car's Safety results

Saturday, December 22 through Wednesday, January 2 – No school - Winter break

Thursday, January 3

• 5th/6th
• P. 182, 18-22 due
• go over problems
• *More safety trends and crash videos
• 7th
• P. 182, 18-22 due
• go over problems

Friday, January 4

• 5th/6th
• Energy conservation in collisions
• Two dimensional collisions
  • A 1250 kg car moving at 20.5 m/s collides with a 1700 kg car in an inelastic collision. Determine the speed at which the two cars move together after the collision. Determine the change in kinetic energy. Determine the average force exerted on the first car if the crumple zone is 1.3 m long.
  • A space ship with a mass of 7600 kg is moving at 125 m/s. Mission control decides to change the direction of the rocket by 30° by expelling a propellant at 3200 m/s perpendicular to the space ship. What mass of propellant must be expelled?
  • A compact car with a mass of 1875 kg is moving north at 25.5 m/s. It collides inelastically with a truck with a mass of 2250 kg moving west at 30.5 m/s. Determine the final velocity of the vehicles as they move off together. If the coefficient of friction is 0.80 how far do they slide?
• *More examples
  • Your friend has been in a car accident and wants your help. She was driving her 1265 kg car north on Oak Street when she was hit by a 925 kg compact car going west on Maple Street. The cars struck and slid 23.1 m 42° N of W. The speed limit is 50 mph (22 m/s) and the coefficient of friction is 0.65. Who was at fault? (There are no witnesses who can attest to who had a green light and the courts will find a speeder at fault.)
• Work on homework
• 7th
• Energy conservation in collisions

Monday, January 7

• 5th
• P. 183, 25-27, 29-30 due
• Go over problems
• 7th
• P. 183, 25-27, 29-30 due
• Go over problems

Tuesday, January 8

• 5th
• Ballistic Pendulum Lab due
• Comparing momentum and kinetic energies in elastic collisions
• The bounce effect
• 6th/7th
• Ballistic Pendulum Lab due
• Two dimensional (glancing) collisions
• *Car safety trends
• The bounce effect

Wednesday, January 9

• 5th
• P. 183, 41-44 due
• Go over problems
• 6th/7th
• P. 183, 41-44 due
• Go over problems
• *A few more car safety trends
• Work on review

Thursday, January 10

• 5th/6th
• Chapter 6 Review due
• Go over problems
• *Intro. to chapter 7
• Circular motion: defining centripetal acceleration and centripetal force
• Why centrifugal forces are fictional forces
• 7th
• Chapter 6 Review due
• Go over problems

Friday, January 11

• 5th/6th
• *Example problems with centripetal accelerations and centripetal forces
• Centripetal forces are always supplied by some other force like tension, friction, springs, etc.
• 6th period: Chapter 6 Test
• 7th
• Chapter 6 Test