A crate travels through a factory on a straight, horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?
A) normal force, weight, static friction
B) normal force, weight, force of the conveyor belt
C) normal force, weight, force of the conveyor belt, static friction
D) normal force and weight

Question

Quizplus · Accepted Answer

The crate experiences only two forces: the normal force from the conveyor belt acting upward and its weight acting downward. Since it moves at a constant speed and air resistance is negligible, there's no need to consider friction or any additional force from the conveyor belt in the vertical direction.

A Crate Travels Through a Factory on a Straight, Horizontal