if work done is scalar quantity then how can it be negetive
Answers
Answered by
0
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
siwach2:
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
Answered by
3
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.
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.
please answer this I beg u
work done is always scalar but it is product of vector quantity so, it can be nagative
do u got it
kk
i have seen in my book also
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
Similar questions