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chapter 8 vocab tms

vocab

QuestionAnswer
work is done when a force causes an 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 1 N acting through a distance of 1 m in the direction of the force (symbol, J)
power is the rate at which energy is transferred
watt the unit used to express power; equivalent to joules per second(symbol, W)
machine is a device that makes work easier by changing the size or direction of a force
work input the work that you do on a machine
work output the work done by a machine
mechanical advantage is the number of times the machine multiplies force
mechanical efficiency is a comparison of a machine's work output with the work input
lever is a simple machine that has a bar that pivots at a fixed point called a fulcrum
pulley is a simple machine that has a grooved wheel over which a rope, chain, or wire passes
wheel and axle a simple consisting of two circular objects of different sizes
inclined plane is a simple machine that is a straight, slanted surface
wedge is a pair of inclined planes thatmove
screw is an inclined plane that is wrapped in a spiral around a cylnder
compound machine a machine made of more than one simple machine
Created by: 1492425611
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