Question

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What condition is satisfied to say that work is not done?

✔Give suitable reason.

Answer 1

Hey Dear !

=) The conditions which is satisfied to say that no work is done are :-

The conditions which is satisfied to say that no work is done are :- (i) Force must be Zero .

The conditions which is satisfied to say that no work is done are :- (i) Force must be Zero .(ii) The force which is applied on a body should not be moved from its place .

The conditions which is satisfied to say that no work is done are :- (i) Force must be Zero .(ii) The force which is applied on a body should not be moved from its place .(iii) The force must be applied at 90° .

Hope , It Helps .

Answer 2

$\huge\mathfrak\red{heya\:Mate}$

$\huge\boxed{\fcolorbox{blue}{pink}{Answer}}$

$\huge\mathbb{Work!!}$

For condition to be satisfied that no work is done is give by formula.

$w = f \times s. \cos( \alpha )$

When alpha=90°, then no work is done.

$\huge\mathbb{Reason!!}$

Now consider a force acting on an object, but the object moves in a direction perpendicular to the force

then work done =0

if the angle θ is 90 degrees how can the work done by F⃗ on the object is zero. Because value of cos90°=0

by putting in equation we get.

$\huge\bf\pink{\mid{\overline{\underline{</em></strong><strong><em>w</em></strong><strong><em>=</em></strong><strong><em>0</em></strong><strong><em>,</em></strong><strong><em>(</em></strong><strong><em>a</em></strong><strong><em>l</em></strong><strong><em>p</em></strong><strong><em>h</em></strong><strong><em>a</em></strong><strong><em>=</em></strong><strong><em>9</em></strong><strong><em>0</em></strong><strong><em>°</em></strong><strong><em>)</em></strong><strong><em>}}}}\mid}$

Ex:-

The work done by Collie in his head is zero work.

The work done by earth on revolution around sun is 0°

Note :- For work=0.

the direction of displacement is not perpendicular to direction of force.