What is a screw? Give two examples.
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A screw is a simple machine which appears like an inclined plane wound around a rod with a pointed tip. Hence, it appears like a nail with grooves on its circular curved surface. Examples : Car jack screw, bottle cap etc.
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What is a pulley?
What is the mechanical advantage of an ideal pulley?
What is wheel and axle ? Give two examples.
How does a wheel help in moving the axle?