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Science - Unit 4 - Topic 1
Levers and Inclined Planes
8
Science
8th Grade
04/15/2018

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Term
Lever
Definition
A simple machine that has a bar that rotates around the fixed fulcrum
Term
Class 1 Lever
Definition
the fulcrum is between the effort and the load.
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Term
Class 2 Lever
Definition
the load is between the effort and the fulcrum.
[image]
Term
Class 3 Lever
Definition
the effort is exerted between the fulcrum and the load.
[image]
Term
Formula for work
Definition
force * distance = work
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Term
Input and Output work
Definition
Input work: the work you do on a machine

Output work: the work the machine does on the load
Term
Two ways to calculate mechanical advantage
Definition
a) Mechanical Advantage(measured in newtons)=
Mechanical Advantage (MA) = Load force (FL) / Effort force (FE)

b) Mechanical Advantage(measured in arm distance)=
Mechanical Advantage (MA) = Effort Arm / Load Arm
Term
ergonomics
Definition
to design machines for people
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