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Which of the following statements is true?

1. The ratio of work output to work input is always greater than one.
2. Windmills change the rotary motion of wind into a straight motion.
3. Efficiency is calculated by dividing work output by work input.
4. All the above.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle