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17 terms

Work and Machines

Support for Chapter 4
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Work
Force times distance
Joule
Unit of measure for work, one Newton Meter
Power
Amount of work done per unit of time
Watt
Unit of measure for power, joule per second
input force
amount of force applied to a machine
output force
amount of force produced by a machine
input work
amount of work applied to a machine
output work
amount of work output by a machine
mechanical advantage
output force divided by input force
Efficiency
(output work divided by input work) times 100
inclined plane
a flat sloped surface, ramp
wedge
a device that is thick at one end and tapers to a point,knife
screw
an inclined plane wrapped around a cylinder, screw
lever
a rigid bar that that pivots around a fulcrum, crowbar
wheel and axel
two circular objects joined together, the larger is the wheel, the smaller is the axel, door knob, screw driver
pulley
a groved wheel and a rope,
compound machine
a machine that uses two or more simple machines