Suppose I throw a ball toward the floor. The ball hits the floor and rebounds upward. What type of fundamental interaction acting between atoms in the ball and the atoms in the floor exerts the force that causes the ball to reverse its direction?
A. The strong interaction
B. The electromagnetic interaction
C The weak interaction
D. The gravitational interaction
E. Some combination of the above (specify)
F. Some other kind of interaction (specify)
G. One cannot determine the interaction without knowing more about inter-atomic interactions.
D. The gravitational interaction
Feedback:
The interaction that causes the rebound is not gravitational (because the gravitational force between atoms very weak and not repulsive), and the strong and weak nuclear forces have ranges that are of order of magnitude of the size of a nucleus, and so cannot exert forces between atoms. So, by process of elimination, the inter atomic forces that cause the ball to bounce must be due ultimately to electromagnetic interactions.
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