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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 |
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constant speed |
speed that stays the same |
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Energy |
the ability to do work or cause change |
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Force |
a push or pull |
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Free-fall |
An object is in free-fall when the only force acting on the object is gravity. |
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Friction |
force that opposes motion; force that one surface exerts on another when the two rub against each other |
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gravity |
force that pulls objects toward Earth;the attractive force between two objects; one of the forces that keeps the planets in their orbits |
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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 |
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kinetic energy |
energy of motion |
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Momentum |
quantity of motionMomentum = mass x velocity |