Simple Machines

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What are simple machines?

Back

Simple machines are basic mechanical devices that help make work easier by allowing us to apply force in a more effective way. They include levers, pulleys, inclined planes, screws, wedges, and wheel and axles.

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What is a lever?

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A lever is a simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum. It is used to lift or move loads with less effort.

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What is a pulley?

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A pulley is a simple machine that consists of a wheel on an axle or shaft designed to support movement and change the direction of force. It is often used to lift heavy objects.

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What is an inclined plane?

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An inclined plane is a flat surface that is tilted at an angle to help raise or lower objects. It reduces the amount of force needed to lift an object by spreading the effort over a longer distance.

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What is a wedge?

Back

A wedge is a simple machine that is used to separate two objects or portions of an object. It is a triangular-shaped tool that converts force applied to its blunt end into forces perpendicular to its inclined surfaces.

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What is a screw?

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A screw is a simple machine that consists of a cylindrical shaft with a helical ridge or thread. It converts rotational motion into linear motion and is used to hold objects together or lift materials.

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What is a wheel and axle?

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A wheel and axle is a simple machine that consists of a larger wheel attached to a smaller axle. When the wheel turns, the axle turns as well, allowing for easier movement of objects.

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How do compound machines work?

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Compound machines are made up of two or more simple machines working together to make work easier. They increase mechanical advantage, allowing a smaller input force to lift a larger load.

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What is mechanical advantage?

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Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device, or machine system. It is the ratio of the output force to the input force.

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Give an example of a compound machine.

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A pair of scissors is an example of a compound machine, as it combines two simple machines: a lever and a wedge.