Question

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 meantime a villager came to help them and the same car was now pushed by three persons at an acceleration of 0.2 m/s2 . After reading the passage carefully answer the following questions: (๐’Š) With what force does each person push the car? (๐’Š๐’Š) Which value is promoted here? (Consider that each person pushes the car with the same efficiency.)

  • Force and laws of motion CBSE Class 9
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Answer

(๐’Š) Mass of the car, m = 1100 kg

Let ๐น be the muscular force applied by each person.

โˆด Force required for moving the car at uniform speed = 2 x F = 2๐น

Total force applied by three persons = 3 ๐น

โˆด Force needed to produce acceleration in the car = 3F – 2F = F

Now acceleration produced in the car, a = 0.2 m/s

โˆด From the definition,

Force = Mass x Acceleration

F = 1100 kg ร— 0.2 m/s2

F = 220 N

(๐’Š๐’Š) Value of helping attitude towards those persons who are really in trouble is shown here.

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