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Potential energy
stored energy; energy of position

Kinetic energy
movement energy; the energy an object has due to its motion

Force
A push or pull exerted on an object

Friction
A force that slows things down/makes them stop. Friction creates heat

Mass
A measure of the amount of matter in an object; measured in grams

Direction
the path that an object is moving or facing

Distance
How far an object moves.

Speed
How fast and far an object moves in a certain amount of time

Gravity
A pulling force between objects that is due to their masses. On Earth, gravity pulls things down towards the center of Earth.

Motion
Change in the direction, position, or speed of an object

Less friction
Smooth surfaces, faster motion (movement)

More friction
Rough surface, slower motion (movement)

Gravitational potential energy
Potential energy that depends on the height of an object. Higher position = MORE potential energy.

Speed and direction describe...
motion.
