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Natural Motion
motion that is straight up or straight down
Violent Motion
imposed motion resulting from an external push or pull
Force
A push or a pull
Inertia
The tendency of an object to resist a change in motion
Mass
the amount of matter in an object
Objects at rest...
stay at rest
Objects in motion...
stay in motion
vector
A quantity that has magnitude and direction
contact forces
forces that have an effect only on objects that they touch
long range forces
forces that act on an object without physical contact
net force
The combination of all forces acting on an object
The equilibrium rule
The vector sum of forces acting on a nonaccelerating object equals 0
speed
The distance an object travels per unit of time
velocity
Speed in a given direction
