A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces exerted on this crate must point
A)down the ramp.
B)up the ramp.
C)perpendicular to the ramp.
D)vertically downward.
E)None of the above choices is correct.

Question

Quizplus · Accepted Answer

Since the crate is moving at a constant speed, it means there is no net acceleration. According to Newton's first law, if there is no net force acting on an object (meaning the object is either at rest or moving at a constant velocity), the vector sum of all forces acting on it must be zero. Therefore, the vector sum of all the forces exerted on the crate does not point in any particular direction; instead, it is zero.

A Crate Is Sliding Down an Inclined Ramp at a Constant