A truck has a crate in its cargo bed. If the truck accelerates forward and the crate does NOT move, in which of these directions is the frictional force that the floor of the cargo bed exerts on the crate?

Question

Quizplus · Accepted Answer

The frictional force must act in the forward direction to prevent the crate from sliding backward due to the truck's acceleration. This force is what keeps the crate stationary relative to the truck.

A Truck Has a Crate in Its Cargo Bed