# Normal force help?

## When a baseball player begins to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During the time that he is in contact with the floor, the force of the floor against his shoe is...?

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Al E. Share
Feb 8, 2018

It is the reaction force on him by the ground as a result of the force he is exerting on the ground.

The normal force is merely the force of contact between two surfaces; generally, it is proportional and opposite in direction of $m g$.

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