Priyanka B Solutions for Chapter: Work and Energy, Exercise 2: Assignment

What would be the amount of work done on an object, if the displacement is zero?

The formula for work done $\left(W\right)$ on a body when the body makes an angle $A$ to the direction of force $\left(F\right)$ is $W=Fs \_\_\_\_\_$,    $\left(cos\mathit{ }A\mathit{ }\mathit{/}\mathit{ }sin\mathit{ }A\mathit{ }\mathit{/}\mathit{ }tan\mathit{ }A\right)$

What is the angle (in degrees) between the direction of force and the direction of motion of a body so that work done is zero?

Given below are a few situations. Study them and state in which of the given cases work is said to be done. Give reasons for your answer.

A bullock pulling cart up to $1 \mathrm{km}$ on road.

Given below are a few situations. Study them and state in which of the given cases work is said to be done. Give reasons for your answer.

A girl pulling a trolley for about $2 \mathrm{m}$ distance.

Given below are a few situations. Study them and state in which of the given cases work is said to be done. Give reasons for your answer.

A person standing with a heavy bag on his head.

In a tug of war, team A wins and team B loses. Which of the team does 

Positive work.

Give reasons for your answer..

In a tug of war, team A wins and team B loses. Which of the team does 

Negative work.

Give reasons for your answer.