mr. johnson perrysville junior high updated 2-3-2010
TRANSCRIPT
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Mr. JohnsonPerrysville Junior High
Updated 2-3-2010
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Terms To Know
Work – done when an applied force causes an object to move in the direction of the force
Energy – ability to cause change; speed, force, shape, or temperature
Load – weight being moved Effort - force placed on an object that cause it
to move.
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What is a Simple Machine?
Tool used to make work easier
Few moving parts Increased mechanical
advantage Increase magnitude
of out put force w/ cost of increased distance moved
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Inclined Plane
Inclined plane is a surface set at an angle, against a horizontal surface.
Use less force over a longer distance to raise an object
Object moves, not inclined plane
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Wedge
Similar to “Inclined Plane”
Does work by moving
More acute the angle of the wedge, the more mechanical advantage it will have.
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Screw
A screw is a helical inclined plane
A screw converts a rotational force, torque, into a linear force
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Pulley
Used to change the direction of an applied force
Realize a mechanical advantage in either a linear or rotational system of motion.
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Wheel and Axle
Wheel & axles multiply the applied force OR distance traveled.
Larger diameter wheels exert stronger forces on axles
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1st Class Lever
fulcrum is located between the input effort and the output load
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2nd Class Lever
fulcrum is at one end, and the applied force at the other, with the load in between
Load moves the same direction as the applied force
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3rd Class Lever Input effort is higher
than the output load Applied force is
between fulcrum and load
Moves Faster