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Unit used to express work


Unit used to express power


Work / time


Force x distance

Work input

Work you do on a machine

Work output

Work the machine does on the object

Inclined Plane

Straight, slanted surface


Bar that pivots at a fixed point


Inclined Plane wrapped in a spiral

Block and Tackle

Two kinds of pulleys used together in a system

Simple Machine

Device that makes work easier by changing the size of the direction of a force


Double inclined plane

Compound Machine

Machine made up of two or more simple machines


Grooved wheel that holds a rope or cable


Fixed point at which a lever pivots

Mechanical advantage

Force Input/ Force Output

Mechanical Efficiency

(Work Input/ Work Output ) x 100%

First Class Level

Fulcrum in middle: example - seesaw

Second Class Lever

Output in middle: example - wheel barrow

Third Class Lever

Input in middle: example- tweezers

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