Question

when the work do not done on object?​

Answer 1

$\mathfrak{\large{\underline{\underline{Answer:-}}}}$

The condition for work done is 0.

We know that the formula for work done is given by :-

$\boxed{\sf</strong><strong>\</strong><strong>r</strong><strong>e</strong><strong>d</strong><strong>{ </strong><strong>W</strong><strong> </strong><strong>=</strong><strong> </strong><strong>F</strong><strong>.</strong><strong> </strong><strong>S</strong><strong> </strong><strong>cos</strong><strong> </strong><strong>θ</strong><strong>}}$

The force can be zero if either following conditions are satisfied :-

• If the force is zero then the work done is also zero.

• If the displacement is zero then the work done is also zero.

• If the angle between the force is right angle then from the value of trigonometric ratio of Cos90° is 0.

★ $\boxed{\sf{ </strong><strong>W</strong><strong> </strong><strong>=</strong><strong> </strong><strong>F</strong><strong>.</strong><strong> </strong><strong>S</strong><strong> </strong><strong>cos</strong><strong> </strong><strong>9</strong><strong>0</strong><strong>°</strong><strong>}}$

$\boxed{\sf{ </strong><strong>W</strong><strong> </strong><strong>=</strong><strong> </strong><strong>0</strong><strong>}}$

Hence, if the angle between the force is 90° then the work done will be zero.

Ex :- The work done by a collie when he lift goods in his head.

The revolution of moon around the earth.