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Box B is stacked on top of box A, you then push box A at a constant rate to the

ID: 1337264 • Letter: B

Question

Box B is stacked on top of box A, you then push box A at a constant rate to the right, is the frictional force causing the motion of box B a static or kinetic friction and how do you know?

Select one:

a. The force is a static frictional force because box B is not moving relative to box A

b. The force is a static frictional force because only static frictional forces can start an object moving

c. Block B is not experiencing a frictional force

d. The force is a kinetic frictional force because box B is moving

e. The force is a kinetic frictional force because only kinetic friction can cause motion

f. This is neither a static nor kinetic frictional force

Explanation / Answer

As box A is moving towards right with constant speed, there will be no pseudo force acts on the box B in opposite direction to the motion of the box A. since there is no force acting on the block B. Without acting any force on box B along horizontal direction. The frictional force on it is zero. Thus, the option (c) is correct answer.

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