If two balanced forces act on an object in opposite directions then that object will remain stationary, and pushes and pulls can change the movement of an object. Given these facts, what can change the movement of something or have it remain stationary among the following options:
- rolling around
 - pulling chains
 - a hydraulic system
 - remaining motionless
 - kinetic energy
 - friction
 - Electrical energy
 - pushes and pulls


 

        pushes and pulls 