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| Question | Answer |
|---|---|
| work | is done only when force causes a change in the position or the motion of an object in the direction of the applied force. |
| power | quantity that measures the rate at which work is done or energy is transformed. |
| mechanical advantage | quantity that measures how much a machine multiplies force or distance. |
| simple machines | one of the 6 basic types of machines which are the basis for all other forms of machines |
| compound machines | a machine made of more than one simple machine |
| potential energy | energy that an object had because of the position or condition of the object |
| kinetic energy | energy of a moving object due to the objects motion |
| mechanical energy | amount of work an object can do because of the objects kinetic and potential energy |
| efficiency | quantity usually expressed as a percentage the measures the ration of useful work output to work input |