Question

If a box is on a ramp and is motionless, what is true about the forces acting on the box?

A. They are all equal.
B. Their net value is zero.
C. They all add up to the weight of the box.
D. The vertical forces are equal and opposite, and the forces up and down the ramp are equal and opposite.

Answer 1

The Answer is A because if something is motionless, say in a liquid, then all forces have to be equal.

Answer 2

Their vector sum (net value) is zero.

If the net force on anything is not zero, then it must be accelerating.