Question

11. A coolie carrying a load on his head and
moving on a frictionless horizontal platform
does no work. Explain the reason​

Answer 1

Answer:

Work done by the coolie will be 0

Explanation:

We know that,

Work is the scalar product or the dot product of force and displacement ie,

Work = Force · Displacement

W = F·S = FScosФ  where Ф is the angle between force and displacement

In the given case of the coolie,

Force is weight of the load which acts vertically downwards

Displacement is in the horizontal direction

Hence,

angle between force and displacement is 90°

Putting this in the equation of work

W = FScos90°

W = FS × 0

W = 0 J

Answer 2

$\huge\star\mathfrak\red{{Hey Mate...!!}}$

● The work done will be zero because a coolie carries a load make an angle of 90 degree wherever the 90 degree created the work done will be zero.

Proof:

W = FS Cos Q

W = FS Cos (90°)

W = FS (0)

W = 0