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McC 8 Physics
| Question | Answer |
|---|---|
| Motion | change in position |
| Force | a push or pull with a size and direction |
| Acceleration | when an object speeds up, slows down, or turns. |
| Inertia | measures the tendency of an object to remain at rest or keep moving. |
| Newton's 1st Law | object remains at rest or moves in a straight line with constant speed unless a force acts on it |
| Newton's 2nd Law | an object acted on by an unbalanced force will accelerate in the direction on the force |
| Newton's 3rd Law | forces always act in equal but opposite pairs |
| Balanced Forces | forces are equal but in opposite directions, canceling each other out |
| Unbalanced Forces | When one force is greater than another, a change in motion (acceleration) will result. |
| Weight | the force of gravity on an object; weight = mass X 9.8 m/s2 (acceleration due to gravity) |
| Acceleration due to gravity | 9.8 m/s2 |
| Contact Forces | involves objects touching each other |
| Long Range or Non Contact Forces | forces that occur at a distance (grvity, magnetism, electricity) |
| Distance | entire path an object travels |
| Displacement | distance and direction between starting and stopping positions |
| Speed | distance traveled divided by the time needed to travel the distance or s = d/t |
| Relative Motion | an object's position change as described in terms of a reference point |
| Constant Speed | speed is the same at any given moment in time |
| Instantaneous Speed | speed at a particular instant in time |
| Friction | a force that resists motion |
| Velocity | displacement over a given time. (Speed with direction)per unit of time. |
| Mass | how much matter is in an object |