Work and Machines

Science

Work and Machines Chapter Video

Work and Machines Chapter Video

compound machine

a machine made of two or more simple machines

compound machine Simple Definition

efficiency

the percentage of energy input that a machine converts to work output

efficiency Simple Definition

fulcrum

fixed point on which a lever pivots

fulcrum Simple Definition

inclined plane

a simple machine with a flat, sloped surface

inclined plane Simple Definition

input force

the force applied to a machine

input force Simple Definition

joule

the SI unit of energy, also known as the Newton-meter

joule Simple Definition

lever

a simple machine that consists of a bar that pivots on a fixed point

lever Simple Definition

machine

a device that makes work easier by changing the size or direction (or both) of a force

machine Simple Definition

mechanical advantage

the ratio of the output force to the input force in a machine

mechanical advantage Simple Definition

output force

the force exerted by a machine

output force Simple Definition

power

the rate at which work is done, it is measured in watts (W)

power Simple Definition

pulley

a simple machine made of a wheel with a rope around it

pulley Simple Definition

screw

a simple machine made of an inclined plane wrapped around a cylinder

screw Simple Definition

wedge

a simple machine made of one or two inclined planes

wedge Simple Definition

wheel and axle

a simple machine made of a wheel with a rod joined at its center, they rotate together

wheel and axle Simple Definition

work

the use of force to move an object over a distance, its unit is the Joule (J)

work Simple Definition

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