ITT Technical Institute
Framingham, Massachusetts
Quarter 6 Electronics Physics
Instructor: Paul Burney

Name __________________________________


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 Formulas

p = mv

F=Dp /Dt = (mvf-mvi) / t

F = ma

pinitial = pfinal

mvi (1)+ mvi (2) = mvf (1)+ mvf (2)

 

  1. A 50 gram tennis ball elastically collides with a 9700 kg wall at a speed of 10 m/s.
    1. What is the final speed of the ball after the collision?





    2. What is the final speed of the wall after the collision?





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





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





  3. A 50 kg skateboarder is riding his 2.3 kg skateboard at a speed of 4 m/s.
    1. What is his momentum?





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





  4. 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)

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

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