Simple Machines

Front

What are simple machines?

Back

Simple machines are basic mechanical devices that help make work easier. They include levers, pulleys, inclined planes, wedges, screws, and wheels and axles.

Front

What is a lever?

Back

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.

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What is a pulley?

Back

A pulley is a simple machine that consists of a grooved wheel with a rope or cable running along the groove. It is used to lift heavy objects.

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What is an inclined plane?

Back

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.

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What is a wedge?

Back

A wedge is a simple machine that is used to split or cut objects apart. It has a thick end and a thin edge.

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What is a screw?

Back

A screw is a simple machine that consists of a spiral inclined plane wrapped around a cylinder. It is used to hold objects together or lift materials.

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What is a wheel and axle?

Back

A wheel and axle is a simple machine that consists of a large wheel attached to a smaller axle. When the wheel turns, the axle turns as well, making it easier to move objects.

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How do levers work?

Back

Levers work by using the fulcrum to change the direction of the force applied. Depending on the position of the load and the fulcrum, levers can multiply force.

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What is the purpose of a pulley?

Back

The purpose of a pulley is to change the direction of a force, making it easier to lift heavy objects by pulling down on the rope.

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How does an inclined plane reduce effort?

Back

An inclined plane reduces effort by allowing a load to be raised over a longer distance with less force compared to lifting it straight up.