5.4.5 Describe what would happen to the values of p1fx and p2fx if p2ix had a va

Question

5.4.5

Describe what would happen to the values of p1fx and p2fx if p2ix had a value of positive one unit instead of negative two units. Assume that the final momenta of the two objects are the same but different from before. Two equal-mass balls made of different material swing down at the end of trings and hit identical bricks. Ball 1 bounces back, whereas Ball 2 flattens and stops when it hits the brick. Ball 1 knocks the brick over and Ball 2 does not. Use your knowledge of impulse- omentum to explain why. Specify the system.

Explanation / Answer

When there is a collision between two objects, Newton's Third Law states that the force on one of the bodies is equal and opposite to the force on the other body.

Therefore, if no other forces act on the bodies (in the direction of collision), then the total momentum of the two bodies will be unchanged. Hence the total momentum before collision in a particular direction = total momentum after in a particular direction.

So Ball 2 consumes all momentum into deformation of itself, on ohter place ball 1 contains momentum after collision.

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