Home
Class 11
PHYSICS
A person walking on a horizontal road wi...

A person walking on a horizontal road with a load on his head does no work.Explain.

Text Solution

Verified by Experts

Man applies force in the vertical direction.
His displacement is along the horizontal direction.
Hence, angle between force `vecF` and displacement `vecS` is `pi/2`
Therefore, `W = FScos pi/2 = 0`.
Promotional Banner

Similar Questions

Explore conceptually related problems

A person is walking on a horizontal road and carrying a briefcase. The work done by the person on the breifcase is ____________

A coolie is walking on a railway platform with a load of 30 kg on his head. How much work is done by coolie?

A coolie moves on a horizontal platform with luggage on his head. The work done by coolie on the luggage is zero.

A person carrying 10 bricks each of mass 2.5 kg. on his head moves to a height 20 metres in 50 seconds. Calculate the power spent in carrying bricks of the person.

A person driving a car suddenlyapplies the brakes on seeing a child on the road ahead. if he is not wering seat belt, he falls forward and hits his head against the steering wheel. Why?

The speed of rotation of a person with some weights in his hands and standing on a rotating platform increases as he draws his arms close to his chest.Why?Explain.

A person is trying to push a box, the whole day he makes use of his stored energy but cannot move it. In physics we say he has not done any work. Explain why?

Calculate the work done by a car against gravity in moving along a straight horizontal road. The mass of the car is 400 kg and the distance moved is 2 m.