# If work done is scalar quantity then how can it be negetive

2
by siwach2

2015-11-05T17:04:18+05:30
Work done is the product of force and displacement. we know that sometimes displacement can be negative. so in this case work done is negative
but then how can it be scalar and scalar quantity kabhi negative nahi hoti
it is a scalar quantity because it is the dot product of force and displacement
u know what is meant by dot product?
but scalar quantity can't be negative
sign convention does not indicate the direction
2015-11-05T17:17:06+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
If the displacement is in a direction opposite to the force,
i.e., θ = 180°, then cos 180° = -1
Therefore,
W = - F * S
The work done is negative. This is usually the case when the force
opposes the motion or it tries to stop a moving body.
Example :-
When a body moves on a surface , the force of friction between the body
and the surface is in a direction opposite to the motion of the body. Therefore,
the work done by the force of friction is negative.
anurag can u draw and send me the graph for freely falling body
I mean displacement time graph
??
free falling and disp. time graph is different and in comment how can i sent u
I have posted this que . answer there