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26 Cards in this Set

  • Front
  • Back
Work
is the product of force and distance
Power
is the rate of doing work
Horsepower
is equal to about 746 watts.
Joule
is the SI unit for work
Watt
the SI unit of power
Machine
is a device that changes a force
Input force
the force you exert on a machine
Input distance
the distance the input force acts through
Work input
the work done by the input force acting through the input distance
Output force
the force that is exerted by a machine
Output distance
the distance the output force is exerted through
Work output
of a machine is the output force multiplied by the output distance
Mechanical advantage
is the number of times that the machine increase an input force
Actual mechanical advantage (AMA)
equls the the ratio of the output force to teh input force
Ideal mechanical advantage (IMA)
is the mechanical advantage in the absence of friction
Efficiency
the percentage of the work input that becomes work optput
Lever
a rigid bar is free to move around a fixed point
Fulcrum
the fixed point the bar rotates around
Input arm
of a lever is the distance between the input force and and the fulcrum
Output arm
is the distance between the output force and the fulcrum
Wheel and axle
is a simple machine that consists of two disks, or cylinders, each one with a different radius
Inclined plane
is a slanted surface along which a force moves an object to a different elevation
Wedge
is a V-shaped whose sides are two inclined planes sloped toward each other
Screw
is an inclined plane wrapped around a cylinder
Pulley
is a simple machine that consits of rope that fits into a groove in a wheel
Compund machine
is a combination of two or more simple machines the operate together