Motion
Occurs when an object changes position
Reference point
Helps to determine how far an object has moved
Distance
Describes how far the object moves
Displacement
is the distance and direction of an object's change in position from the starting point
Speed
The distance an object travels per unit of time
Average speed
is the total distance divided by the total time it took to travel
Velocity
the speed of an object and the direction of its motion
Force
a push or pull that one body exerts on another
Net force
When two or more forces act on an object at the same time
Balanced forces
Forces that are equal in size and opposite in direction
Inertia
the tendency of an object to resist change in its motion
Acceleration
Rate of change of velocity