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Work, Energy and Machines

even if a large force is exerted on an object, no work is performed if the object does not move
power the rate at which work is done
effort and resistance two forces always involved in using a machine are
efficiencey is the comparison between work output and work input
mechanical advantage decreasing the slant of an incline plane increases its
neither force nor distance is muliplied by a(n) fixed pulley
a gear in a watch is an example of a(n) wheel and axle
work equals force X time
joule or newton-meter is the unit of work in the metric system i
power work divided by time
machine an instrument that makes work easier
work input the work that goes into a machine
work output the work done by the machine
machines make work easier because they change either the size or the directions of the force put into a machine
wedge an incline plane that moves
screw an inclined plane wapped around a central bar, or cylinder, to form a spiral
lever rigid bar that is free to pivot, or move about a fixed point
fulcrum the fixed point about which a lever rotates
first class lever the fulcrum is located between the resistance force and the effort force
second class lever the resistance force is located between the fulcrum and the effort force
third class lever the elfort force is located between the resistance force and fulcrum
pulley a rope, belt, or chain wrapped around a grooved wheel
wheel and axle machine made up of two circular objects of different sizes----in a sense, a wheel in a wheel
compound machine a combination of two or more simple machines
power rate at which work is done
watt the unit of power in the metric system