Part C
Now, set the mass of both balls to be equal. Increase the distance between them by pulling one of
the balls away from the other. To pull a ball away, click on the ball and drag it. What happens to
the force arrows between the two balls? What does this mean in terms of gravity?
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Newton’s first two laws of motion explain how the motion of a single object changes. If the forces acting on the object are bal- anced, the object will remain at rest or stay in motion with con- stant velocity. If the forces are unbalanced, the object will accelerate in the direction of the net force. Newton’s second law tells how to calculate the acceleration, or change in motion, of an object if the net force acting on it is known.

Newton’s third law describes something else that happens when one object exerts a force on another object. Suppose you push on a wall. It may surprise you to learn that if you push on a wall, the wall also pushes on you. According to Newton’s third law of motion,