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The rate of change of the velocity (velocity is the speed and direction).
Acceleration
speed + direction
Velocity
the amount of matter something has
Mass
How fast an object is moving
Speed
A push or pull upon an object resulting from the object's interaction with another object
Force
Forces that cause a change in the motion of an object.
Unbalanced Force
The force that resists motion when the surface of one object comes in contact with the surface of another. object.
Frictional Force
A force that resists the sliding and rolling of one solid object over another.
Friction
A force that causes an object to move from its place of rest.
Push or Pull
A force that exists between the Earth and the objects that are near it. As you stand upon the Earth, you experience this force.
Gravity
