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Machines
Chapter F2
Question | Answer |
---|---|
work | force x distance |
machine | device that changes the amount of force applied to an object |
lever | simple machine that has an arm that moves around a fixed point |
fulcrum | fixed point |
effort arm | part of a lever where a person applies a force |
resistance arm | part of a lever that applies force on an object |
pulley | wheel that has a groove along its edge |
wheel and axle | simple machine in which either a wheel turns on an axle or vice versa |
inclined plane | any flat, sloping surface |
wedge | simple machine made up of two or more inclined planes |
screw | inclined plane wrapped around a cylinder or cone |
compound machine | device made up of two or more simple machines |
efficiency | the ratio of work coming out of a machine to the work being put into the machine |