A constant force acts on a particle that undergoes a displacement
PHYSICS · Multi-part · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
A constant force F acts on a particle that undergoes a displacement d. The symbols ∣F∣, ∣d∣ and θ denote, respectively, the magnitudes of the force and displacement vectors and the angle between them.
(i) Define the physical quantity \"work\" for this situation and state its SI unit.
(ii) Starting from the component of F along d, derive an expression for the algebraic value of work in terms of ∣F∣, ∣d∣ and θ.
(iii) Using the result of part (ii), explain with reason when the work is (a) positive, (b) zero, and (c) negative. Give one everyday example for each of the three cases.