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The place where an object is found.
Position
A change in an object’s position over time.
Motion
How fast an object’s position changes over time.
Speed
The speed and direction of an object.
Velocity
A change in velocity over time.
Acceleration
A push or pull that can change an object’s motion.
Force
A force that requires objects to touch.
Contact Force
A force that acts between objects without touching.
Noncontact Force
The tendency of an object to resist changes in its motion.
Inertia
A force between surfaces that opposes motion and slows or stops objects.
Friction
A noncontact force that pulls objects toward one another, such as toward Earth.
Gravity
A cyclist travels east at a fast pace. Which term describes both the cyclist’s speed and direction?
Velocity
A soccer ball slows down as it rolls across grass. What force mainly causes it to slow down?
Friction