what is a machine? machine: a device that makes work easier by changing the size or direction of a...
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WHAT IS A MACHINE?
Machine: A device that makes work easier by changing the size or direction of a force
When you think of a machine, you may think of things such as cars, big construction equipment, or even computers, but not all machines are complicated…..
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SIMPLE MACHINES
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WORK INPUT & OUTPUT
Work Input: The work being done on a machine
Work Output: The work beingdone by a machine
**In the pictured example, the screwdriver is the machine
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MECHANICAL ADVANTAGE
Mechanical Advantage is the number of times a machine multiplies force.
In other words, it compares the input force with the output force.
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MECHANICAL ADVANTAGE
A machine has mechanical advantage if the output force is greater than the input force
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TYPES OF SIMPLE MACHINES
1) Lever
2) Pulley
3) Wheel and Axle
4) Inclined Plane
5) Wedge
6) Screw
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LEVER
Lever: A simple machine that consists of a bar that pivots at a fixed point called a fulcrum
Example: Have you ever seen a nail get removed from a piece of wood with a hammer? If so, the hammer was being used as a lever
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PULLEY
Pulley: A simple machine that has a grooved wheel that holds a rope or cable
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WHEEL AND AXLE
Wheel and Axle: A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
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INCLINED PLANE
Inclined Plane: A simple machine that is a straight, slanted surface, which facilitates the raising of loads.
• Example: A ramp is an example of an inclined plane
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WEDGE
Wedge: A simple machine that is made up of two inclined planes and that moves
• Example: Some very commonly used wedges are knives and doorstops
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SCREW
Screw: A simple machine that consists of an inclined plane wrapped around a cylinder
• Used most commonly as fasteners
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COMPOUND MACHINES
Compound Machine: A machine made of more than one simple machine