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14 terms

Chapter 14 Set 2

STUDY
PLAY
mechanical advantage
the number of times that a machine increases an input force
actual mechanical advantage
the ratio of the output force to the input force in a machine
ideal mechanical advantage (IMA)
the mechanical advantage of a machine in the absence of friction
efficiency
the percentage of the work input that becomes work output in a machine
lever
a rigid bar that is free to move around a fixed point
fulcrum
the fixed point a lever rotates around
input arm
the distance between the fulcrum in a lever and the input force
output arm
the distance between the fulcrum in a lever and the output force
wheel and axle
a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius
inclined plane
a slanted surface along which a force moves an object to a different elevation
wedge
a V-shaped object whose sides are two inclined planes sloped toward each other
screw
an inclined plane wrapped around a cylinder
pulley
a simple machine that consists of a rope that fits into a groove in a wheel
compound machine
a combination of two or more simple machines that operate together