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13 Cards in this Set
- Front
- Back
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Motion |
A change in the position of an object |
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Reference Point |
A place or object used to determine if an object is in motion |
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Speed |
The rate at which an object changes position |
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Direction |
A course along which someone or something moves |
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Velocity |
The speed and direction of a moving object |
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Acceleration |
If the rate, speed, or direction changes |
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Balanced Forces |
Balance forces are two forces acting in opposite directions on an object, and equal in size. When this happens the object stays still |
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Unbalanced Forces |
When balanced forces act on an object at rest, the object will not move.Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces |
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Friction |
The resistance that one surface or object encounters when moving over another |
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Magnetism |
Objects that produce fields that attract or repel other objects |
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Momentum |
The quantity of motion of a moving body, measured as a product of its mass and velocity |
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Gravity |
The force that attracts a body toward the center of the earth, or toward any other physical body having mass |
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Inertia |
A tendency to do nothing or to remain unchanged |
