ITT Technical Institute

Framingham, Massachusetts

Quarter 6 Electronics Physics

Instructor: Paul BurneyName __________________________________

Momentum (Test #7)

Instructions:Please solve the following problems. Credit will be given for work completed so make sure to show it! Some helpful information can be found below.

Momentum Formulasp = mv

F=Dp /Dt = (mv

_{f}-mv_{i}) / tF = ma

p

_{initial}= p_{final}mv

_{i (1)}+ mv_{i (2)}= mv_{f (1)}+ mv_{f (2)}

- A 50 gram tennis ball elastically collides with a 9700 kg wall
at a speed of 10 m/s.

- What is the final speed of the ball after the
collision?

- What is the final speed of the wall after the
collision?

- What is the final speed of the ball after the
collision?
- A 0.2 kg cue ball rolling at 1.4 m/s elastically collides
directly with a 0.2 kg 9-Ball.

- What is the final speed of the cue ball after the
collision?

- What is the final speed of the 9-Ball after the
collision?

- What is the final speed of the cue ball after the
collision?
- A 50 kg skateboarder is riding his 2.3 kg skateboard at a
speed of 4 m/s.

- What is his momentum?

- If is 22 kg sister hops up with him, what is their final
speed?

- What is his momentum?
- A 70 kg skier playing football on a snowy mountain is moving
at 8 m./s when he unexpectedly crashes into a tree. If the
average force acting upon him as he stops is -3450 N, how long
does it take him to come to a complete stop?

BONUS QUESTIONS (10 points each)

- As discussed in class, explain why a rocket can
get rid of its empty stages to increase its velocity.

- Describe one part of the video we watched on momentum, and explain how it helped you to understand momentum better.

- As discussed in class, explain why a rocket can
get rid of its empty stages to increase its velocity.