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Unit 6 6th Grade
Work, Power, and Simple Machines
Question | Answer |
---|---|
work | what is necessary for a force to move an object through a distance; work is calculated by multiplying the force applied to an object by the distance the object moves |
power | the amount of work done per unit of time |
efficiency | the ratio between the work done by a machine and the work put into it |
simple machine | a device with few, if any, moving parts that makes it easier to do work |
mechanical advantage | the number of times a simple machine multiplies an effort force |
lever | a simple machine consisting of a bar and pivot point |
fulcrum | the pivot point of a lever |
wheel and axle | a simple machine that consists of a wheel that applies an effort force and a smaller axle that produces an output force |
pulley | a grooved wheel that turns by the action of a rope in the groove |
inclined plane | a straight, slanted surface that can multiply an effort force |
screw | a simple machine made of an inclined plane wrapped around a central bar that can multiply an effort force |
wedge | an inclined plane that changes the direction of an applied force |