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Vocabulary
Machines
Term | Definition |
---|---|
machine | any device that helps people do work by changing the way the work is done |
work input | work that you do on a machine |
work output | work done by the machine on an object |
input force | force you apply to a machine through a distance |
output force | the force a machine exerts on an object |
mechanical advantage | the number of times the machine multiplies the input force |
mechanical efficiency | a comparison of a machine’s work output with the work input |
lever | a simple machine that has a bar that pivots at a fixed point |
fulcrum | the fixed point of a lever |
wheel and axle | a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle |
pulley | a simple machine that has a grooved wheel that holds a rope or a cable |
inclined plane | a simple machine that is a straight, slanted surface |
wedge | a pair of inclined planes that move |
screw | an inclined plane wrapped around a cylinder |