1. Conservation of Momentum Tuesday, January 14, 2014

2. Conservation of Momentum– Tuesday, 1/14  Take out homework from yesterday  Pick up warm-up from Physics Bin (3 minutes to complete)  Read the ‘I can statement’ on the side board  Reminder: Momentum test on Tuesday, 1/21.

3. Question 1 Use the words in the word bank to complete the sentence below (note: you will not use all of the words). Word bank: mass, momentum, acceleration, time, impact, weight, impulse, and force. In a collision, an object experiences a(n) _______ acting for a certain amount of ______ which is known as a __________; it serves to change the __________ of the object.

4. Question 2 Use the GUESS method to calculate the momentum of a 2.0 kg brick moving through the air at 12 m/s.

5. Question 3 Using the GUESS method calculate the impulse experienced by a 0.168 kg tennis ball encountering a force of 126 N that changes its velocity by 61.8 m/s.

6. Question 4 Player #32 has an inelastic collision with player #81. Player #32 has a mass of 100 kg and is traveling at 3.75 m/s. Player #81 has a mass of 130 kg and is traveling at -4.10 m/s. What is the final velocity of the players after they collide. a. Draw a picture of the collision b. Use the GUESS method to solver for final velocity.

7. Question 5 Bob and Sally are playing bumper cars at Disney World. Bob sees that Sally’s cart has stopped moving and decides to accelerate his car and bump her. Bob’s 350 kg car is traveling at 12 m/s when he hits Sally’s 300 kg car. After the collision Sally’s car is traveling at 10 m/s. What is the velocity of Bob’s car after the collision? a. What type of collision is taking place? b. Draw a picture of the collision. c. Use GUESS to calculate the final velocity of Bob’s car.

8. Question 6 Train ‘A’ is parked on the track and has a mass of 5000 kg. Train ‘B’ is traveling on the same track as train ‘A’ and has a mass of 1000 kg. Train ‘B’ is traveling at 25 m/s when contact is made with train ‘A’. After the collision train ‘B’ slows to 20 m/s. what is the velocity of train ‘A’ after the collision? a. What type of collision has taken place. b. Draw a picture of the collision. c. Use the GUESS method to calculate the v f of train A.

9. Question 7 A 15 kg medicine ball is thrown at a velocity of 2 m/s to a 60 kg person who is at rest on ice. The person catches the ball and subsequently slides with the ball across the ice. a. What type of collision has taken place. b. Draw a picture of the collision. c. Calculate the final velocity the ball/person.