Two constantly force f1={3i + 4j + 5k }N and f2={5i - 2j - 2k }N act together on particle during it's displacement from {15i + 10j}m to {8k}m . what will b the work done....
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Answer:
Given that,
Force
F
=5
i
^
+3
j
^
+2
k
^
Displacement
s
=3
i
^
−
j
^
+2
k
^
We know that,
The work done is
W=
F
⋅
s
W=(5
i
^
+3
j
^
+2
k
^
)⋅(3
i
^
−
j
^
+2
k
^
)
W=15−3+4
W=16J
Hence, this is the required solution
(b). we know that,
Work done = force ∙ displacement
W=
F
⋅
d
W=Fdcosθ
Where, θ is the angle between
F
and
d
This is a scalar product and work is a scalar
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