A force of 1 kgf displaces a body by a distance of 10 cm (i) in direction of force, (ii) normal to the … done in each case. (Take: g…
Answers:
Given: F = 1 kgf = 1 x g Newton
(i) When displacement is in direction of force.
θ = 00, cos 00 = 1
W = F x d = 9.8 x 0.1 = 0.98 J.
(ii) When displacement is normal to the force
θ = 900 , cos 900 = 0, i.e., W = 0.
(iii) When displacement is at an angle of 600 to the direction of force
θ = 600 or, cos 600 = 1/2
W = F. d cos θ = 9.8 x 0.1 x 1/2 = 0.49 J.