The work done by a force acting obliquely is given by the formula: W = F Cos θ × s. What will happen to the work done if angle between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant?
On increasing the value of angle between force and distance, the value of Cos θ decreases to zero when θ=90∘.Therefore, work done decrease as angle increase, work done is 0 when θ = 90∘ and work done is negative when angle further increases.
Cos θ reduces further to –1.
Therefore, work done decrease as angle increase, work done is 0 when θ=90∘ and work done is negative when angle further increases.