Question

A train moves forward at a constant speed. What is true about the forces

acting on the train? SC.C.2.3.6
A. The forward forces are equal to the forces acting in the backward
direction.
B. The forward forces are greater than the forces acting in the backward
direction.
C. The forward forces are smaller than the forces acting in the backward
direction.
D. There can never be any force acting on the train when it moves at a
constant speed.

Answer 1

An object moves at a constant speed if the net force acting on it is zero.

So, the correct answer is A: forwards and backwards forces cancel each other, and the train moves with constant speed.