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science chapt.
science vocab. and definations for chapt. 2
Question | Answer |
---|---|
work | force x distance |
machine | a device that changes the amount of a force applied to an object , the direction of the force or both |
lever | a simple machine having an arm about a fixed point |
fulcrum | the fixed point on a lever |
effert arm | the part of a lever on which a person or another machine appiles a force on |
resistance arm | the part of a lever that applies a force on an object |
pulley | a wheel that has a groove along its edges |
wheel and axle | a simple machine that hascentral pivet around which a wheel moves |
inclined plane | a flat sloping surface |
wedge | a simple machine that is made up of two of more inclined planes |
screw | an inclined plane wrapped around a cylinder or a cone |
compound machine | a device that is made up of two or more machines |
efficiently | the ratio of the work that comes out of a machine to the work put into that machine |