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16 terms

Science Ch. 15

STUDY
PLAY
Work
force acting through a distance
Power
rate at which work is done, or the amount of work per unit of time.
Watt
The unit of power
Machine
An instrument that makes work easier
Work Input
The work that goes into the machine.
Work Output
The work done by the machine.
Efficiency
The comparison of work output to work input.
Mechanical Advantage
The number of times a machine multiplies the effort force.
Inclined Plane
An example is a ramp.
Wedge
an inclined plane that moves.
Screw
An inclined plane wrapped around a central bar.
Lever
a rigid bar that is free to pivot, or move about a fixed point.
Fulcrum
The fixed or pivotal point on a lever.
Pulley
a rope, belt, or chain wrapped around a grooved wheel.
Wheel and Axle
Simple machine made up of two circular objects.
Compound Machine
A combination made up of two or more simple machines.