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science vocab 3
| Question | Answer |
|---|---|
| force | a push or pull exerted on an object in order to change the motion of the object; force has size and direction |
| motion | an object's change in position relative to a reference point |
| reference point | a stationary object that is used to describe object's motion |
| speed | the distance traveled divided by the time interval during which the motion occurred |
| velocity | the speed of an object in a particular direction |
| acceleration | the rate at which velocity changes over time;an object accelerates if its speed,direction,or both change |
| friction | a force that opposes motion between two surfaces |
| net force | the combination of all the forces acting on an object |
| balanced force | stated when the net forces acting on an object equal zero |
| unbalanced force | stated when the net forces acting on an object is not zero |
| inertia | the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object |
| gravity | a force of attraction between objects that is due to their masses |
| work | the transfer of energy to an object by using a force that causes the object to move in the direction of the force |
| machine | an apparatus using or applying mechanical power and having several parts, each with a definite function and together performing a particular task. |
| inclined plane | a plane inclined at an angle to the horizontal. |
| wedge | a triangular shaped tool, and is a portable inclined plane, and one of the six classical simple machines. |
| screw | an act of turning a screw or other object having a thread. |
| lever | a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other. |
| pulley | a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights. |
| wheel and axle | a simple lifting machine consisting of a rope that unwinds from a wheel onto a cylindrical drum or shaft joined to the wheel to provide mechanical advantage. |
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jackiboyfan
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