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10 Cards in this Set

  • Front
  • Back

acceleration

rate at which velocity changes; an increase in speed, decrease in speed, or change in direction

constant speed

speed that stays the same

Energy

the ability to do work or cause change

Force

a push or pull

Free-fall

An object is in free-fall when the only force acting on the object is gravity.

Friction

force that opposes motion; force that one surface exerts on another when the two rub against each other

gravity

force that pulls objects toward Earth;the attractive force between two objects; one of the forces that keeps the planets in their orbits

inertia

the tendency of a moving object to continue moving or a stationary object to remain in place unless acted on by an outside force; one of the forces that keeps the planets in their orbitSee also Newton's first law of motion

kinetic energy

energy of motion

Momentum

quantity of motionMomentum = mass x velocity