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Science CH 14 study guide
study guide
30
Science
8th Grade
12/09/2012

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Term
What are the six simple machines?
Definition
inclined plane, lever, wheel and axle, screw, wedge, and pulley
Term
flat, sloped surface
Definition
inclined plane
Term
when a force causes an object to move in the same direction that the force is applied
Definition
work
Term
push or pull
Definition
force
Term
inclined plane that moves
Definition
wedge
Term
the number of times a machine increases the input force
Definition
mechanical advantage
Term
how quickly work is done
Definition
power
Term
the force you apply on a machine
Definition
input force
Term
rigid rod that pivots about a point
Definition
lever
Term
force that a machine applies
Definition
output force
Term
ratio of the output work to the input work
Definition
efficiency
Term
consists of a grooved wheel with a rope or cable wrapped over it
Definition
pulley
Term
machine that does work with only one movement
Definition
simple machine
Term
machine made up of a combination of simple machines
Definition
compound machine
Term
inclined plane wrapped around a post
Definition
screw
Term
2 circular objects of different sizes that are attatched in such a way, they rotate together
Definition
wheel and axle
Term
What is the equation for work?
Definition
W=FD
Term
What is the SI unit for work?
Definition
joule
Term
Who is the SI unit for work named after?
Definition
James Prescott Joule
Term
What is the SI unit for power?
Definition
watt
Term
Who is the SI unit for power named after?
Definition
James Watt
Term
device that makes doing work easier
Definition
machine
Term
combination of a fixed and movable pulley
Definition
pulley system
Term
What fills the gaps between the surfaces and keeps many of the high spots from making contact?
Definition
oil
Term
doesn't change the force you exert or the distance exerted
Definition
fixed pulley
Term
allows you to exert a smaller force to lift the objects
Definition
movable pulley
Term
What are 2 examples of a wedge?
Definition
axe and certain doorstops
Term
point about which the lever pivots
Definition
fulcrum
Term
What's another term for inclined plane?
Definition
ramp
Term
What is the equation for power?
Definition
P=W/T
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