Question

3. Grandma is canning apple jelly today. After pouring the hot fruit into the jars, she tightens the lid. Which simple machine is used here?

Answer 1

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here is you're answer:-

A jar opener is an example of a second-class lever. The fulcrum in the jar opener  is at one end, where the two metal rods of the device are hinged together. The effort force is applied at the opposite ends of the rods, and the resistance force, the lid to be open,which lies in the middle.