Multiple choice

Which of the following activities requires force of friction?

  1. Rolling

  2. Writing

  3. Walking

  4. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rolling objects need friction between wheel and surface to grip (otherwise they'd just spin in place). Writing requires friction between pen/paper to leave marks. Walking requires friction between feet and ground to push forward without slipping. All depend on friction.

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