1. Assigned work: pg. 237 # 7-9 (1D momentum) pg. 238 # 4-6 (1D momentum ) pg. 245 # 5-7 (1D momentum ) pg. 252 # 12, 13 (collisions) pg. 253 # 4-6 (collisions) pg. 257 # 3-5 (2D momentum) pg. 258 # 3,4 (2D momentum)

2. Momentum in 1D A 10. gram bullet is shot into a 2.0 kg block of wood suspended by a 1.0 m long rope suspended from the ceiling. During the collision the bullet is embedded in the block. After the collision the block-bullet swings up 53 degrees. Can you answer the following 4 questions?

3. Momentum in 1D 1. How much potential energy does the block-bullet have when they reach 53 degrees?

4. Momentum in 1D 2. How fast was the block-bullet travelling after the collision?

5. Momentum in 1D 3. How fast was the bullet originally travelling before it collided with the block?

6. Momentum in 1D S. Evans 4. What percent of the bullet’s original kinetic energy was lost during the collision?

7. Momentum in 1D A 20. gram bullet is fired at a 3500 gram block which is initially at rest on a table. The bullet embeds itself in the block resulting in the block sliding 1.75 metres before coming to a stop. The coefficient of friction is 0.40 between the block and table. Can you answer the following questions? S. Evans

8. Momentum in 1D S. Evans 1. How much kinetic energy was lost as the block was brought to a stop?

9. Momentum in 1D 2. How fast will the bullet-block be sliding immediately after the collision?

10. Momentum in 1D 3. How fast was the bullet travelling before it struck the block?

11. Momentum in 1D A man shoots a 7.0 gram bullet with a horizontal velocity of 150. m/s into a 3.0 kg pumpkin sitting on a post. 1. If the bullet embeds itself into the pumpkin with what speed will they leave the post?

12. Momentum in 1D 2. If the post is 1.0 m tall, how far from the base of the post will the pumpkin hit the ground (horiontal distance)?

13. Momentum in 1D 3. What will the pumpkin’s impact velocity be?

14. Momentum in 1D 4. If the dirt from the ground where the pumpkin hits offers a resisting force of 750. N, how deep of a dent in the ground will the pumpkin make as it is brought to rest?

15. Momentum in 2D A ball of mass 1.0 kg is moving along the x axis toward the origin at 10. m/s. It delivers a glancing hit to a stationary 4.0 kg mass. After the collision the 1.0 kg travels off at 37 degrees above the x axis at 5.0 m/s.

16. Momentum in 2D 1. Find the velocity of the 4.0 kg ball after the collision.

17. Momentum in 2D 2. Was the collision elastic or inelastic? Explain.