Question

What should be the angle between force and displacement so that no work is done?

Answer 1

hey there!!

if the angle will be 90° then work done will be zero as the angle will increase work done will go in minus.
◆◆◆◆◆◆◆◆◆◆◆

Answer 2

work = (force).(displacement)

i.e. work = dot product of force and displacement

=> work = force. displacement. cos( θ)

we know that ..

cos (90)= cos (π/2) = 0

=> for θ= angle between force and displacement = π/2=90°
we have work done =0 joules

hence.... angle between force and displacement should be 90° for work to be 0joules

hope it helps you...
☺☺