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Chapter 8 Vocab

QuestionAnswer
Work The transfer of energy to an object by using a force that causes the object to move in the direction of the force
Joule The unit used to express energy
Watt the unit used to express power
power the rate at which work is done or energy is transformed
Machine A device that helps do work by either overcoming a force or changing the direction of the applied force
Work input the work done on a machine; the product of the input force and the distance through which the force is exerted
work output the work done by a maching; the product of the output force and the distance through which the force is exerted
Mechanical Advantage A number that tells how many times a machine multiplies force
Mechanical Efficiency a quantity, usually expressed as a percentage, that measures the ratio of work output to work input; it can be calculated by dividing work output by work input.
Lever a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
Pulley a simple machine that consists of a wheel over which a rope, chain, or wire passes
Wheel and Axle a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
Inclined Plane a simple machine that is a straight, slanted surface which facilitates the raising of loads; a ramp is an example
Wedge a simple machines that is made up of two inclined planes and that moves
Screw a simple machine that consists of an inclined plane wrapped around a cylinder
Compound machine a machine made of more than one simple machine
Created by: ilovelucy21
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