• 4th/5th
• Chapter 5 Test
• *Car Collisions: It's basic physics
• Visit Insurance Institute for Highway Safety and safercar.gov web sites
• Defining impulse and momentum
• High speed collision videos
• 5th
• Chapter 5 Test
• 6th/7th
• Chapter 5 Test
• *Car Collisions: It's basic physics
• Visit Insurance Institute for Highway Safety and safercar.gov web sites
• Defining impulse and momentum
• some example problems
• High speed collision videos

Wednesday, January 11

• 4th
• Some momentum example problems
• 6th
• *Car Collisions: It's basic physics
• Visit Insurance Institute for Highway Safety and safercar.gov web sites
• Defining impulse and momentum
• 8th
• Some momentum example problems

Thursday, January 12

• 4th
• The Bounce effect
• * More Chapter 6 Example Problems
• Law of Conservation of Momentum
• Difference between elastic and inelastic collisions (coefficient of restitution)
• 5th/6th
• Law of Conservation of Momentum
• Difference between elastic and inelastic collisions (coefficient of restitution)
• The Bounce effect
• High speed videography examples
• * 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?
• 8th
• The Bounce effect
• * More Chapter 6 Example Problems
• Law of Conservation of Momentum
• Difference between elastic and inelastic collisions (coefficient of restitution)

Friday, January 13

• 4th
• P. 180 conceptual #4–5 and P. 181 problems #1-6 due
• Go over problems
• *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?
• 5th/6th
• P. 180 conceptual #4–5 and P. 181 problems #1-6 due
• Go over problems
• 8th
• P. 180 conceptual #4–5 and P. 181 problems #1-6 due
• Go over problems

Monday, January 16 – No school – Martin Luther King, Jr. Day

Tuesday, January 17– Mr. Flint out ill today

• Work on upcoming homework problems

Wednesday, January 18

• 4th
• P. 181, conceptual #6–7 and P. 182, problems 8–13 due
• Go over problems
• 6th
• P. 181, conceptual #6–7 and P. 182, problems 8–13 due
• Go over problems
• 8th
• P. 181, conceptual #6–7 and P. 182, problems 8–13 due
• Go over problems

Thursday, January 19

• 4th
• The bounce effect
• Discuss conceptual problems from yesterday
• 5th/6th
• The bounce effect
• Discuss conceptual problems from yesterday
• *Intro. to the Ballistic Pendulum Lab
• 8th
• The bounce effect
• Discuss conceptual problems from yesterday

Friday, January 20

• 4th
• P. 182, 18-22 due
• hand in problems
• 5th/6th
• P. 182, 18-22 due
• hand in problems
• Intro. to ballistic pendulum lab
• *Collect Ballistic Pendulum Lab Data
• 8th
• P. 182, 18-22 due
• hand in problems

Monday, January 23

• 4th/5th
• Intro. to ballistic pendulum lab - conservation of energy in collisions
• *Collect ballistic pendulum lab data
• homework questions?
• 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?
• 7th/8th
• Intro. to ballistic pendulum lab - conservation of energy in collisions
• *Collect ballistic pendulum lab data
• homework questions?

Tuesday, January 24

• 4th/5th
• Intro. to momentum lab - trouble with equipment - try again another day
• *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.
• 6th
• 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?
• 7th/8th
• Intro. to momentum lab
• *Collect momentum lab data

Wednesday, January 25

• 4th
• Intro. to momentum lab
• 2D collisions
• 6th
• 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?
• 8th
• Intro. to momentum lab
• *Collect momentum lab data

Thursday, January 26

• 4th
• P. 181 conceptual #17–18 and P. 183 problems #25–27, 29–30 due
• Go over problems
• 5th/6th
• P. 181 conceptual #17–18 and P. 183 problems #25–27, 29–30 due
• Intro. to Conservation of Energy Lab
• *Collect Conservation of Energy Lab data
• Work on problems
• 8th
• P. 181 conceptual #17–18 and P. 183 problems #25–27, 29–30 due
• Go over problems

Friday, January 27

• 4th
• Did we do the billiard ball 2-D collision example?
• Do you need to collect Ballistic Pendulum or Momentum Lab data?
• Your friend was in a car crash and wants your help. She was driving her 1265 kg car north on Oak Street when she collided with a 925 kg 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 problems
• 5th/6th
• Did we do the billiard ball 2-D collision example?
• Do you need to collect Ballistic Pendulum or Momentum Lab data?
• Your friend was in a car crash and wants your help. She was driving her 1265 kg car north on Oak Street when she collided with a 925 kg 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 problems
• 8th
• Did we do the billiard ball 2-D collision example?
• Your friend was in a car crash and wants your help. She was driving her 1265 kg car north on Oak Street when she collided with a 925 kg 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 problems

Monday, January 30

• 4th/5th
• Ballistic Pendulum Lab due
• Car Safety data and Car Safety trends
• 6th
• Ballistic Pendulum Lab due
• Car Safety data and Car Safety trends
• 7th/8th
• Ballistic Pendulum Lab due
• Car Safety data and Car Safety trends

Tuesday, January 31

• 4th/5th
• Momentum Lab due
• Car Safety
• 6th
• Momentum Lab due
• Car Safety
• 7th/8th
• Momentum Lab due
• Car Safety

Wednesday, February 1

• 4th
• P. 183, 41-44 due
• Go over problems
• 5th
• P. 183, 41-44 due
• Go over problems
• 8th
• P. 183, 41-44 due
• Go over problems

Thursday, February 2 and Friday, February 3 – No school – Parent/Teacher Conferences

Monday, February 4

• 4th/5th
• Chapter 6 Review due
• Go over problems
• *Intro. to circular motion
• 6th
• Chapter 6 Review due
• Go over problems
• 7th/8th
• Chapter 6 Review due
• Go over problems

Tuesday, February 5

• 1st
• Chapter 6 Test
• 5th
• Chapter 6 Test
• 7th
• Chapter 6 Test