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In this unit we are going to learn about machines, different simple machines we use in our everyday life, such as the pulley, the lever and the inclined plane.

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A pulley uses a wheel, an axle and a rope to lift objects up and lower them.

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A lever makes it easier to move an object.

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The inclined plane is useful to move objects up or down along a ramp.

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In this unit we will learn about inventions and inventors, people who invented important

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machines many years ago.