Question 21
A father and son pushed their car to bring it to the side of the road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.

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Solution

Initially, they had to apply force to set the car in motion but once the car started rolling, they had to apply force only to balance rolling friction of the car, the value of which is very less.

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Q. A father and son pushed their car to bring it to the side of the road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.

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Two boys push a car of mass 1000 kg at a uniform velocity along a level road. The same car can be pushed by three boys to produce an acceleration of 0.5 m $s^{- 2}$ .. With what force does the person push the car? ( The effort with which the boys pushed the car was the same)

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. What force should be applied to make the car accelerate at

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Two friends were going for a short tour and on the way the car suddenly stopped.Both of them managed to push the car of mass 1100 kg at a uniform velocity along a level road. In the mean time a villager came to help them and the same car was now pushed by three persons at an acceleration of 0.2 m/s^2 (i)Which value of the villager is promoted here? (ii)With what force these three persons pushed the car?

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Frictional Force

Standard VI Physics

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