Two friends push with great force against a rock. The forces are equally strong but in opposite directions. A heavy box rests on top of the rock. Answer these questions about the motion of the rock. Assume that the rock is light enough for either friend to carry.

Does the rock move? If so, in which direction does it move? Explain.

Two friends push with great force against a rock. The forces are equally strong but in opposite directions. A heavy box rests on top of the rock. Rock does not move because equal forces are applied on both sides.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to define force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Force is used to describe a body's tendency to alter or change its condition as a result of an external cause. When force is applied, the body may also alter its size, shape, and direction. kicking a ball, opening and closing doors, or mixing dough are some examples.

Thus, rock does not move because equal forces are applied on both sides.

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