HOMEWORK FOR LAB 7: NEWTON’S THIRD LAW AND CONSERVATION OF MOMENTUM



Please list the members of your group:
  1. A weight lifter struggles but manages to keep a heavy barbell above his head. Occasionally he slips and the barbell starts to fall downward, but he always recovers. In each case compare the force exerted by the weight lifter on the barbell to that exerted by the barbell on the weight lifter. Explain your answers.

    1. With the barbell at rest.

    2. With the barbell moving upward.

    3. With the barbell moving downward.


Copyright © 2018 John Wiley & Sons, Inc.

HOMEWORK FOR LAB 7: NEWTON’S THIRD LAW AND CONSERVATION OF MOMENTUM

  1. A bowling ball rolls down the alley and hits a pin. Compare the force exerted by the ball on the pin to the force exerted by the pin on the ball during the collision between the ball and the pin. Is one force larger than the other or are they equal in magnitude to each other? Does this relationship of the magnitudes of the two forces change at any time during the collision? Explain.

  1. A tennis player hits the ball with her racket. Compare the force exerted by the racket on the ball to that exerted by the ball on the racket during the collision between the racket and the ball. Is one force larger than the other or are they equal in magnitude to each other? Does this relationship of the magnitudes of the two forces change at any time during the collision? Explain.

HOMEWORK FOR LAB 7: NEWTON’S THIRD LAW AND CONSERVATION OF MOMENTUM

  1. Describe the shapes of the force vs. time graphs for the force exerted by a tennis racket on a ball and the force exerted by the ball on the racket during their collision. Explain the shapes of your graphs.

  2. An automobile of mass 1500 kg moving at 25.0 m/s collides with a truck of mass 4500 kg at rest. The bumpers of the two vehicles lock together during the crash.

    1. Compare the force exerted by the car on the truck with that exerted by the truck on the car during the collision. Is one force larger than the other or are they equal in magnitude to each other?

    2. What is the final velocity of the car and truck just after the collision? show your calculations.

  3. The same collision as in Question 5 takes place, only this time the car and the truck bounce off each other completely elastically. Compare the force exerted by the car on the truck with that exerted by the truck on the car during the collision. Is one force larger than the other or are they equal in magnitude to each other?

ALL DONE!

Please remember to edit the report (insert your name - and if necessary your partners), export the report and submit it on D2L.


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