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26 terms

Phisical Science Vocab Chapter 14

STUDY
PLAY
work
activity directed toward making or doing something.
joule
si unit of energy.
power
(physics) the rate of doing work.
watt
a unit of power equal to 1 joule per second.
horsepower
a unit of power equal to 746 watts.
machine
any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.
input force
the force exerted 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.
work output
the work done by a machine.
output force
the force exerted on an object by a machine.
output distance
the distance the output force is exerted through.
mechanical advantage
the ratio of the force exerted by a machine to the force applied to it.
ideal mechanical advantage
the mechanical advantage that a machine would have without friction.
actual mechanical advantage
the mechanical advantage that a machine provides in a real situation.
efficiency
the ratio of the output to the input of any system.
lever
a rigid bar pivoted about a fulcrum.
fulcrum
the pivot about which a lever turns.
input arm
the distance between the input force and the fulcrum.
output arm
the distance between the output force and the fulcrum.
inclined plane
a simple machine for elevating objects.
wheel and axle
hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel.
wedge
something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them.
screw
slang terms for sexual intercourse.
pulley
a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.
compound machine
a machine made of more than one simple machine.