Two identical billiard balls strike a rigid wall with the same speed, and are re

Question

Two identical billiard balls strike a rigid wall with the same speed, and are reflected without any change of speed. The first ball strikes perpendicular to the wall. The second ball strikes the wall at an angle of 30º from the perpendicular, and bounces off at an angle of 30º from perpendicular to the wall.

Determine the direction of the force on the wall due to each ball.

Choose correct answers:

-Perpendicular to the wall

-Parallel to the wall

-At 30 degrees relative to the wall

-At 60 degrees relative to the wall

Explanation / Answer

average force =change in momentum/time

change of momentum occurs perpendicular to the wall

so

the direction of the force on the wall due to each ball in perpendicular to the wall

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