Question

Which of the following is an example of an object that could have a net force greater than zero acting on it?
A. a glass resting on a table
B. a ball rolling down a ramp
C. a ladder leaning against a wall
D. a toy car moving east at a constant velocity

Answer 1

Net force is basically the force an object has when changing direction, so the answer would be D. 

Answer 2

An object could have a net force greater than zero acting on it is a toy car moving east at a constant velocity because of the direction it moves.