Motion

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The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite In direction to the force of gravity.

A measure of the amount of matter in an object.

Speed

The rate at which velocity changes over time.

A push or a pull exerted on and object in order to change the motion of an object; force has size and direction

The speed of an object in a particular direction

A measure of the gravitational force exerted on an object.

A part of a longitudinal wave where the particles are crowded together.