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Chapter 5 vocabulary
section 1,2, and 3
| Question | Answer |
|---|---|
| transfer of energy that occurs when a force makes an object move measured in joules | work |
| amount of work done or the amount of energy transferred divided by the time required to do the work or transfer the energy measured in watts | power |
| device that makes doing work easier by increasing the force applied to an object, changing the direction of an applied force, or increasing the distance over which a force can be applied | machine |
| the force exerted on a machine | input force |
| what the machine does to the object | output force |
| ratio of the output force exerted by machine to the input force applied to the machine | mechanical advantage |
| ratio of the output work done by the machine to the input work done on the machine, expressed as a percentage. | efficiency |
| machine that does work with only one movement lever pulley wheel and axle, inclined plane, screw and wedge | simple machine |
| simple machine consisting of a bar free to pivot about a fixed point called the fulcrum | lever |
| simple machine that consists of a grooved wheel with a rope chain or cable running along the groove can be either fixed or movable | pulley |
| simple machine that consists of a shaft or axle attached to the center of a larger wheel so that the shaft and the wheel rotate together | wheel and axle |
| simple machine that consists of a sloping surface, such as a ramp that reduces the amount of force needed to lift something by increasing the distance over which the force is applied | inclined plane |
| a simple machine that consists of an inclined plane wrapped in a spiral around a cylindrical post | screw |
| a simple machine that is and inclined plane with one or two sloping sides | wedge |
| machine that is combination of two or more simple machines | compound machine |