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PS Ch. 5
Vocab
Term | Definition |
---|---|
Work | The transfer of energy that occurs when a force makes an object move. |
Power | The amount of work done in one second. |
Machine | A device that makes doing work easier |
Input force | The force that is applied to the machine |
Output force | The force that is applied by the machine |
Mechanical Advantage | The ratio of the output force to the input force. |
Effciency | The measure of how much of the work put into a machine is changed into useful output work by machine. |
Simple Machine | a machine that does work with only one movement of the machine. |
Lever | a bar that is free to pivot or turn around a fix point. |
Pulley | A grooved wheel with a rope, chain, or cable running along the groove |
Wheel and Axle | A simple machine consisting of a shaft or axle attached to the center of a larger wheel, so that wheel and axle rotate together. |
Inclined Plane | A sloping surface such as a ramp that reduces the amount of force required to do work. |
Screw | an inclined plane wrapped in a spiral around a cylindrical post. |
Wedge | an inclined plane with one or two slopping sides |
Compound Machine | Two or more simple machines that operate together. |