Multiple choice

Which of the following examples proves that the work done by energy is not always visible?

  1. a boy throwing a baseball

  2. a fire heating up a room

  3. a man pulling a suitcase

  4. a gardener pulling up weeds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heat transfer is a form of energy transfer that is not always directly visible as motion, unlike the other examples which involve clear mechanical work.

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