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Machines. Imagine you want to squeeze some lemonade. What takes less effort? To squeeze

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it by hand or to use a squeezer? And if you want to dig a hole in the ground, what takes

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less effort? To do it by hand or to use a spade? Now, look at this man. He's asking

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himself how can I make this work easier? How can he lift the boxes up to the truck, up

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to the lorry with less effort? He can use a ram. Look, this man is pushing the box onto

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the ram. 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. Or instead

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of lifting the boxes onto the lorry, we can use a ram. Now, simple machines like these

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

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they don't use any electricity or batteries. These simple machines are the ram, the pulley

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and the lever. Let's see more about them. The ram, we use it to raise and lower objects

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

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a ram that has been broken into little steps. Or I can use a screw. The pulley, it's a wheel

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with a rope and we use it to lift heavy objects. Look, I can pull down the rope and this object

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goes up. I can use it in a well or the zip line or the drying line. The lever, it's a

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strong bar and we use it to lift and move something heavy. Look at this man, he's pushing

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down the bar to lift this heavy stone. And it's the same process for the seesaw, the

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spoon or the catapult. Now, complex machines are made of many parts. Look at this one,

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this bike has got a lever, a pulley and another lever. Can you identify the simple and complex

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things in this picture? Goodbye!