Apologia Physical Science Module 9 & 10
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21 terms
Terms | Definitions |
|---|---|
 Mechanics | study of motion, forces, and energy. |
| Reference Point | a point against which a position's movement is measured. |
| Speed | how quickly a motion occurs; a scalar quantity; distance traveled / time traveled = ________ |
| Velocity | speed and direction; a vector quantity |
| Vector Quantity | a physical measurement that contains directional information |
| Scalar Quantity | a physical meausrement that does not contain directional information |
| Objects traveling in the same direction | relative speed is the diference between their individual speeds |
| Objects traveling in the opposite direction | relative speed is the sum of their individual speeds |
| Acceleration | the time rate of change of an object's velocity |
| Acceleration | (final velocity - initial velocity) / time = ______________. |
| Free Fall | the motion of an object when it is falling solely under the influence of gravity. |
| 9.8 meters/second squared | Metric rate of acceleration due to gravity |
| 32 feet/second squared | English rate of acceleration due to gravity |
| distance | ___________ = 1/2 x (acceleration)(time) squared |
| inertia | An object's resistance to change |
| friction | A force that opposes motion, resulting from the contact of two surfaces |
| kinetic friction | Friction that opposes motion once the motion has already started. |
| static friction | Friction that opposes the initiation of motion |
| Newton's First Law | An object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force. |
| Newton's Second Law | When an object is acted on by one or more outside forces, the total force is equal to the mass of the object times the resulting acceleration. |
| Newton's Third Law | For every action, there is an equal and opposite reaction |
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