Physics
Grade-9
Easy

Question

Which is the odd one out?

  1. Walking
  2. Stopping vehicles
  3. Slows down the speed
  4. Energy is wasted

hintHint:

Friction between our feet and ground allows movements and helps in walking. So it is an advantage of friction.

The correct answer is: Walking


    Walking is the odd one out.
    • Stopping vehicles and slowing down the speed of an object are activities that need an external force.
    • This produces heat resulting in wastage of energy.
    • Maximum friction takes place when a moving object is stopped.
    • Walking is an activity that creates friction between the foot and the road and can be controlled without an external force.

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