NCERT solution for class 9// Science // Chapter 11 --Work and energy
NCERT solution > Class 9 > Science . NCERT solution for class 9// Science // Chapter 11 --Work and energy Chapter 11- Work and energy Page number 148. Q1. A force of 7 N on an object the displacement is say 8 m in the direction of the force let us take it that the force acts on the object through displacement what is the work done in this case. Answer- Force , F = 7 N Displacement S = 8m . Work W = F x S W = 7 x 8 = 56 Nm. Page number 149 . Q2. When do we say that work is done? Answer- When the force is applied and object and object moves through a distance in the direction of applied force then we say that work is done It is equal to the product of force and displacement W = F x S Q3. Write an expression for the work done when a force is acting on an object in the direction of its displacement? Answer- When a force F is applied on a body and it moves the body by distanc...