Shadowing Practice: Simple Machines – Screws - Learn English Speaking with Video
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You've probably seen this scene before.
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A person lines up two pieces of wood, grabs a screwdriver, places a screw, and twists it in place.
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Suddenly, those two pieces become firmly locked together.
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But how does a simple twist create such a strong grip?
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A screw is a type of simple machine.
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It looks like a nail with grooves called threads spiraling around it it.
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When you turn the screw, these threads help push or pull the screw through a material, like wood or plastic, with much less force than if you tried to shove it straight in.
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We use screws more often than you might realize.
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Jar lids twist on and off using screw threads.
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A light bulb fits into its socket the same way.
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Even a car jack uses a large screw to lift a heavy vehicle off the ground.
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Underneath these grooves is a clever concept, an inclined plane wrapped in a spiral.
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By turning the screw, you spread out the effort over a longer distance, making it easier to secure or lift objects.
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So next time you see a screw at work, whether it's turning on a faucet or grinding pepper, remember it's one of the most effective simple machines around.
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It's a small invention with a big impact on our everyday tasks.
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