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Science-3-3

Science- Chap. 3 Less. 3

QuestionAnswer
Simple machines machines that do work using only one movement
6 Simple Machines lever, wheel and axle, inclined plane, wedge, screw, pulley
lever a simple machine made up ofa bar that pivots, or rotates, about a fixed point.
fulcrum the point about which a lever pivots
input arm the distance from the fulcrum to the input force
output arm the distance from the fulcrum to the end of the object that does the action
three types of levers first-class, second-class, third-class
What is the difference between the three types of levers? Where the input force and the output force are relative to the fulcrum
First-Class Lever The fulcrum is between the input force and the output force and the input and output forces are in different directions
Second-Class Lever the output force is between the input force and the fulcrum and the output force and the input force act in the same direction. The output force is greater than the input force
Third-Class Lever the input force is between the output force and the fulcrum and the output force is less than the input force, but they act in the same direction
Mechanical Advantage of Levers the length of the input arm divided by the length of the output arm
Equation for MA of Levers IMA= L-in L-out
wheel and axle an axle attached to the center of a wheel and both rotate together
axle is another work for... shaft
Mechanical Advantage of Wheel and Axle the radius of the wheel divided by the radius of the axle
Equation for MA of wheel and axle IMA= r-wheel r-axle
inclined plane a flat, sloped surface
Mechanical Advantage of Inclined Plane the length of the inclined plane divided by the height of inclined plane
Equation for MA of Inclined Plane IMA=l h
the longer the plane... the less force is needed to move an object
wedge a sloped surface that moves
screw an inclined plane wrapped around a cylinder
Created by: 2016stamerh
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