Question

What is work done by a porter carrying load on his head while walking along a level road. explain with the help of mathematical expression

​

Answer 1

Answer:

Work done by any force is given by dot product of force and displacement of the particle.

So W=F.S

Where F,S are vector quantities and W is scaler quantity.

SI Unit of work done is N.m and also called Joule(J).

So work done in above case is W=FSCosθ, here θ=90

∘

Because person moves horizontal and force of gravity is vertical.

So work done is Zero.

Hence above statement is true

Explanation:

Answer 2

Answer:

Work done by a porter carrying load on his head while walking along a level road is zero.

Explanation:

• Work done by any force is the dot product ( scalar product) of the Force and displacement .
• W = F. s
• W = FsCosθ
• where F is the force acting, here the force acting is the gravitational force whose value is mg, s is the displacement and θ is the angle between the force and displacement.
• force and displacement.The force in this case is gravitational force which is acting downwards, and since the Potter is moving any where, the displacement is zero.
• Hence, W is zero.
• So, the work done by the poter is zero.

#SPJ2