Joshua stands on a floor that supports him.When Sydney rides piggy-back on Joshua,the support force by the floor beneath Joshua
A)decreases.
B)remains constant.
C)increases.

Question

Quizplus · Accepted Answer

The support force by the floor is actually the normal force, which is equal to the force exerted by the floor on Joshua to counteract his weight. When Sydney is added, the total weight on the floor increases, as both Joshua and Sydney's weights are being supported. Therefore, the normal force must increase to counteract the increased weight and prevent Joshua and Sydney from falling through the floor. Thus, the correct choice is C, the support force increases.

Joshua Stands on a Floor That Supports Him