A father and his son started pushing their stalled car on the road, initially they experienced that they had to push harder to move the car and once the car started rolling the push required to keep the car moving was smaller. What type of friction is responsible here?

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Static Friction

Fluid Friction

Sliding Friction

Rolling Friction

answer is D.

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Detailed Solution

Rolling friction is responsible for this.
When one body rolls down on another, the friction between them is called rolling friction. When one body slides over another, the friction between them is called sliding friction. Rolling friction is always less than sliding friction.
In the above case, when the car is stalled, the friction between the tyres of the car and the road is sliding friction. However, once the car starts to move, rolling friction comes into action, which requires less force to overcome the friction as compared to sliding friction.

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