Machine does work with one motion true. for example wind fan
B. Chemical energy stored in the fuel, thermal energy when it is burned, mechanical energy as a sort of intermediate to turn it into electrical energy.
A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.
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Answer:
Presbyopia occurs when the aging lens of your eye becomes less flexible and can no longer focus on objects up-close. Think of your eye like a camera. The lens in the camera has the ability to autofocus on objects whether they are near or far. The lens in your eye works much the same way.