2006-09-08 07:25:50 · 5 answers · asked by Jayant Kumar 1 in Science & Mathematics ➔ Physics
W=F.S
F=MA
A=V/T
*V=AT SINCE,T=O V=O *A=O
*F=O SO NO WORK IS DONE.
OR
WORK IS SAID TO BE DONE IF A BODY MOVES IN THE DIRECTION OF FORCE.
SINCE TIME=O S=O *W=O
2006-09-09 02:00:36 · answer #1 · answered by manu n 1 · 0⤊ 0⤋
because in case of resolution of a force vector,the components give the impact of that force along that particular direction.if u draw the vector diag. of a force being applied on a body u will see that the angle between the displacement vector & the force vector is 'theta' & the component of force in direction of theta is Fcos'theta' for which you take F.s.cos'theta' as work done by definition of dot product of 2 vectors(hope u know).
2006-09-09 12:10:31 · answer #2 · answered by V.D. 1 · 0⤊ 0⤋
It is rather hard to explain without using a picture. By multiplying by cosine you are finding the component of the force pushing on you that is actually pointed in the direction you are moving in.
2006-09-08 14:30:48 · answer #3 · answered by bruinfan 7 · 0⤊ 0⤋
You can use sec if you want to. Just remember to divide by it, not multiply! Better yet, don't try to reinvent the wheel--use the standard formula unless you can show that it doesn't apply.
2006-09-08 14:46:32 · answer #4 · answered by Steve 7 · 0⤊ 0⤋
well work=F.S
where . specifies scalar product of two vectors.
in funda vector product of two vectors is multiplicaion of thier magnitude multiplied by the cos off angle between them.
so thats y it can only be cos 0,
2006-09-08 14:37:40 · answer #5 · answered by wildeve h 1 · 0⤊ 0⤋