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Chapter 8 vocab

vocab

QuestionAnswer
work the transfer of energy to an object by ussing a force that causes the object to move in the direction of the force.
joule the unit used to express energy; equivalent to the amount of work done by a force of 1N acting through a distance of 1m in the direction of the force (symbol, j)
power the rate at which work is done or energy is transformed
watt the unit used to express power; equivalent to joules per second (symbol, w)
machine a device that helps do work by either overcoming a force or changing the direction of the applied force.
work imput the work done on a machine; the product of the imput force and the distance through which the force is excerted
work output the work done by a machine; the product of the output force and the distance through which the force is excerted
mechanical advantage a number that tell 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 consists of two circular objects of different sizes; the wheel is the larger of the two circular objects
inclined plane a straight, slanted surface which facilitates the rising of loads; a ramp
wedge a simple machine that is made up of two inclined planes and that moves; often used for cuttting
screw consists of an inclined plane wrapped around a cylander
compound machine a machine made up of two or more simple machines
Created by: acarroll
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