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Q.

Is it true that if a coolie is walking on a railway platform with a $50 kg$ load on his head, zero work is done?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
In this case, the force applied by the coolie on the load is acting upwards against the gravity and the displacement is in the horizontal direction. Since, both the force and displacement are perpendicular to each other, the work done is zero.
we know work done is

W = F s cos θ

● $F$ is the force applied

● $d$ is the displacement

● $θ$ is the angle between the force and displacement vectors.

\Rightarrow W = F s cos 90 °

\Rightarrow W = F \times s \times 0

(as

\cos 90 ° = 0

)

\Rightarrow W = 0

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