Physics
Grade-9
Easy
Question
Which is the odd one out?
- Walking
- Stopping vehicles
- Slows down the speed
- Energy is wasted
Hint:
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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