Quiz Practice (10 min) A kg bullet is shot from a gun with an initial velocity of 300 m/s. The bullet collides perfectly inelastic with a 5.0 kg wooden block and is embedded inside. Draw a picture for the initial situation and another picture for the final situation. Draw a momentum bar chart for the situation. (The system is the bullet and the block) Determine the velocity of the bullet after the collision. Determine the momentum of the bullet after the collision. Determine the momentum of the block after the collision. Turn in when done.

Try this! (7 min on own) A 1.5 kg tennis ball is thrown up against a wall. The tennis ball collides with the wall elastically with an initial speed of 11.0 m/s. The collision between the tennis ball and the wall takes approximately 0.03 s. Determine the average force that the wall exerts on the tennis ball. Draw a picture for the initial situation and another picture for the final situation. Draw a momentum bar chart for the situation. (The system is the tennis ball) Determine the impulse between the wall and the tennis ball. Determine the average force that the wall exerts on the tennis ball.\ When done turn to a partner and check your answer.

It is the first day of school and you have a brand new box of pencils in your backpack! Unfortunately, as the year goes on, it becomes increasingly difficult to find a pencil, and your friends want to know where they all went. Use sketches, words, and any other representations you think are necessary to explain to them that the disappearance of pencils really depends on what system you are looking at. Define a system in which: The number of pencils decreases The number of pencils remains constant The number of pencils is conserved Figuring out the Systems (5 min)