How Tools Work. The Six Simple Machines Lever Inclined Plane Wedge Screw Pulley Wheel and...
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Transcript of How Tools Work. The Six Simple Machines Lever Inclined Plane Wedge Screw Pulley Wheel and...
![Page 1: How Tools Work. The Six Simple Machines Lever Inclined Plane Wedge Screw Pulley Wheel and Axle.](https://reader036.fdocuments.us/reader036/viewer/2022062516/56649e355503460f94b237df/html5/thumbnails/1.jpg)
How Tools Work
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The Six Simple Machines
Lever
Inclined Plane
Wedge
Screw
Pulley
Wheel and Axle
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Lever
A bar that pivots on a fulcrum—a fixed point
Levers apply force to a load
Three classes, depending on placement of fulcrum, load, and input force
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Inclined Plane
A straight, slanted surface Ex: a ramp
Requires less input force than going straight up
***does NOT reduce work (W= f x d)
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Wedge Two inclined planes
that move Often used for
cutting You a knife down as
it cuts apart
The sharper the wedge, the greater output force for your input force
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Screw An inclined plane
wrapped in a spiral around a cylinder Usually used as
fasteners
Smaller force over a longer distance The small force of
you turning pushes the screw along its spiraled threads
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Pulley A grooved wheel
that holds a rope or cable
A load is attached to one end of the rope, and the input force is applied to the other end
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Wheel and Axle Two circular objects of
different sizes used to create a larger output force
Turn the larger circle around a longer distance as the smaller circle, traveling a shorter distance, creates a larger output force
The larger the wheel, the less force needed to move the load
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Compound Machines
A machine made up of two or more simple machines
Most machines in the world, including how your body works, are compound
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Mechanical Advantage How many times a
machine multiplies force
Mechanical Advantage is calculated by dividing the output force by the input force MA= out/in
If MA > 1, the machine helps lift heavy objects
If MA < 1, the machine increases the distance and reduces the output force
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Name that Machine!