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Chapter 8

Work and Machines Voc.

QuestionAnswer
joule the metric unit of work
work what happens when an object changes its position by moving in the direction of the force being applied
power the amount of work a person does within a given amount of time
watt the unit used to measure power
energy the ability to do work
kinetic energy energy of motion
potential energy stored energy
Law of conservation of energy energy cannot be created or destroyed
simple machines a tool with few parts that make it easier or possible to do work
lever a simple machine containing a bar that can turn around a fix point
fulcrum a fixed point around which a lever rotates
Effort force the force applied to a machine by the user
Resistance force the force applied to a machine by the object to be moved
work input work put into a machine by its user
work output work done by a machine against the resistance
efficiency how well a machine performs
mechanical advantage factor by which a machine multiplies the effort force
effort arm the distance between the fulcrum and the effort force of a lever
resistance arm the distance between the fulcrum and resistance force of a lever
pulley a simple machine made up of a rope, chain, or belt wrapped around a wheel
inclined plane a simple machine made up of a ramp, used to lift an object
screw a simple machine made up of an inclined plane wrapped around a straight piece of metal
wedge a simple machine made up of an inclined plane or pair of inclined planes that are moved
wheel and axle a simple machine made up of a wheel attached to a shaft
Created by: ldydye1
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