A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force.
(a) Write the expression for the work done by the force.
(b) What should be the angle between force and displacement so that the work done is
(i) zero,
(ii) maximum?
Answers
Answered by
1
Answer:
90 degree
Explanation:
As work is given by formula FScosθ and we know cos has minimum value at an angle of 90 degree that is cos 90
o
=0.
Hence work becomes zero when angle is 90
o
.
Answered by
15
Explanation:
(a) Work done when force is at an angle θ to the direction of displacement,
▶W = F S cos θ
(b) (i) The angle between force and displacement should be 90° as cos 90° = 0 for zero work done.
▶W = F S cos 90°
▶W = FS × 0
▶W = 0
(ii) The angle between force and displacement should be 0° as cos 0° = 1 for maximum work done.
▶Then, W = FS cos 0°
▶W = FS
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