Flash Education

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: (π’Š) With what force does each person push the car? (π’Šπ’Š) Which value is promoted here? (Consider that each person pushes the car with the same efficiency.)

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Answer

(π’Š) Mass of the car, m = 1100 kg

Let 𝐹 be the muscular force applied by each person.

∴ Force required for moving the car at uniform speed = 2 x F = 2𝐹

Total force applied by three persons = 3 𝐹

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

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

∴ From the definition,

Force = Mass x Acceleration

F = 1100 kg Γ— 0.2 m/s2

F = 220 N

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

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