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Simple Machines (Pgs. 124-135) (Levers (How it Works (You move the lever,…
Simple Machines (Pgs. 124-135)
Inclined Plane
An inclined plane is flat, sloped surface
An inclined plane allows you to exert your input force over a longer distance
Mechanical advantage
You can determine the ideal mechanical advantage of an inclined plane by dividing the length of the incline by its height
Wedge
A Wedge is a device that is thick at one end and tapers to a thin edge at the other end
How It Works
You put a force onto the wedge for it to wedge between objects
Mechanical Advantage
The Ideal mechanical advantage of a wedge is determined by dividing the length of the wedge by its width
There are six basic kinds of simple machines: The Inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley.
Screws
A Screw can be thought of as an inclined plane wrapped around a cylinder
How it Works
When you exert input force on to a screw by turning it it would bury itself in what your screwing it into
Mechanical advantage
The Ideal Mechanical advantage of a screw is length around the threads divided by the length of the screw
Levers
A Lever is a rigid bar that is free to pivot, or rotate, on a fixed point
How it Works
You move the lever, rotating it, or pivoting it, in order for it to activate, like a paint can opener
Mechanical advantage
The Ideal Mechanical advantage of a lever is determined by dividing the distance from the fulcrum to the input force by the distance from the fulcrum to the output force
Different types of levers
Levers are classified according to the location of the fulcrum relative to the input and output forces
Wheel and axle
A wheel and axle is exactly like how it sounds like, a wheel, or two fastened around an axle
How it works
You apply an input force to the handles, and then the axle makes the output force
Mechanical advantage
You can find the ideal Mechanical advantage of a wheel and axle by dividing the radios of the wheel by the radius of the axle
Pulley
How it works
A pulley is used by attaching one end of the rope to an object, and pull the other end, the rope will help pull the object up
Types of pulleys
There are two kinds of pulleys: Movable pulleys, and Fixed pulleys, which are self explanatory
A pulley is made of a grooved wheel with a rope or cable wrapped around it
Mechanical advantage
The Ideal Mechanical advantage of a pulley is equal to the number of sections of rope that support the object
Simple Machines in the human body
Living Levers
Most of the machines in your body are levers that consist of bone and muscles
Working wedges
Your Teeth's incisors are wedges, which split the food in order to make it smaller and more edible
Compound machines
A compound machine is a machine that utilizes two or more simple machines
The Ideal mechanical advantage of a compound machine is the product of the individual ideal Mechanical advantages of simple machines that make it up