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UnitF Chapter2
Question | Answer |
---|---|
work | the result when a force causes an object to move |
machine | a device that changes the amount of a force applied to an object to the direction of a force or both |
lever | a simple machine having an arm that moves about a fixed point |
fulcrum | the fixed point on a lever |
effort arm | the part of a lever on which a person or another machine applies a force |
resistance arm | the part of a lever that applies a force on a object |
pulley | a wheel that has a groove along its edge |
wheel and axle | a simple machone that has a centeral pivot around which a wheel moves |
inclined plane | a flat sloping surface |
wedge | a simple machine composed of one or two inclined planes |
screw | an inclined plane wrapped around a cylinder or cone |
compound machine | a device that is made up of one or two more simple machines |
efficiency | the ratio of the work that comes out of a machine to the work put into that machine |