Multiple choice

Wheel is said to be one of the greatest inventions for man kind because it can

  1. increase friction

  2. reduce friction

  3. eliminate friction

  4. generate energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The wheel reduces friction by converting sliding friction into rolling friction. This fundamental principle transformed transportation, allowing heavy loads to be moved with much less effort. The wheel doesn't eliminate or generate energy - it reduces wasteful friction.

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