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Collision
When one moving object hits another (moving or
still)
Inertia
An object’s resistance to changing its motion
Force
A push, pull, or twist
Velocity
Speed and direction
Acceleration
A change in velocity (speed or direction)
Unbalanced force
Forces applied to an object in opposite directions that are not
equal in size.
Balanced Force
Forces that are opposite in direction and equal in size.
Contact force
Interactions between objects that touch
Non-Contact force
Attract or repel, even from a distance
Energy
The ability to do work or cause change
Newton
The standard unit of force (N).
Net Force
The combination of all forces acting on an object.
Terminal Velocity
Constant speed reached by an object falling when the upward force of drag equals the downward force of gravity