Fact 1: If two balanced forces act on an object in opposite directions then that object will remain stationary. Fact 2: Pushes and pulls can change the movement of an object. Given the two facts above, what can change the movement of something or have it remain stationary?
Options: 1). rolling around; 2). pulling chains; 3). a hydraulic system; 4). remaining motionless; 5). kinetic energy; 6). friction; 7). Electrical energy; 8). pushes and pulls;
Answer:
8).