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Machines. Imagine you want to squeeze some lemonade. What takes less effort? To squeeze it by hand or to use a squeezer? And if you want to dig a hole in the ground, what takes less effort to do it by hand or to use a spade?

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Now, look at this man. He's asking himself, how can I make this work easier? How can he lift the boxes up to the truck, up to the lorry, with less effort?

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Mm-hmm. He can use a ramp. Look, this man is pushing the box onto the ramp.

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Now, machines are things that make our work easier because we use less effort.

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For example, instead of squeezing a lemon by hand, we can use a squeezer.

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Or instead of lifting the boxes onto the lorry, we can use a ramp.

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Now, simple machines like these ones, they don't use any batteries or any electricity.

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The ramp, the spade and the squeezer, they don't use any electricity or batteries.

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These simple machines are the ramp, the pulley and the lever.

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Let's see more about the ramp.

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We use it to raise and lower objects easily.

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For example, I can go down the slide, I can go up and down the staircase.

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This is a ramp that has been broken into little steps.

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Or I can use a screw, a pulley.

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It's a wheel with a rope and we use it to lift heavy objects.

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Look, I can pull down the rope and this object goes up.

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I can use it in a well, or the zip line, or the drying line.

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The lever. It's a strong bar and we use it to lift and move something heavy.

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Look at this man. He's pushing down the bar to lift this heavy stone.

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And it's the same process for the seesaw, the spoon or the catapult.

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Now, complex machines are made of many parts. Look this one.

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This bike has got a lever, a pulley and another lever.

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Can you identify the simple and complex machines in this picture?

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Goodbye.