Multiple choice general knowledge

Friction can be reduced by changing from

  1. rolling to sliding

  2. sliding to rolling

  3. potential energy to kinetic energy

  4. dynamic to static
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rolling friction is significantly less than sliding friction because rolling involves less surface contact area between surfaces. When an object rolls, only a small portion of its surface touches the ground at any instant, reducing friction. Converting from sliding to rolling (like using ball bearings or wheels) is a fundamental principle in mechanical design to reduce energy loss and improve efficiency.

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