Multiple choice general knowledge math & puzzles

a sphere undergoes pure rolling. The force of friction acting at the point of contact if no external foce is applied is ____ .

  1. rolling friction

  2. static friction

  3. zero

  4. none of these

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

In pure rolling on a horizontal surface with no external forces (like air resistance or an applied torque), the acceleration is zero. Therefore, no friction is required to maintain the rolling state, and the static friction is zero.