NCERT Solutions Class 9 Science Chapter 11 Work and Energy

In-Text Questions Solutions In Text-Questions Page 148 A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?Ans:- When a force […]

Class 9 Work and Energy Important Questions

Work and Energy Important Questions Define 1 watt of power. What is the commercial unit of energy. Convert it to the S.I. unit. Derive the formula for kinetic energy. . State law of conservation of energy. Show that the total mechanical energy for a freely falling body remain constant/conserved. Calculate the total electricity bill amount […]

Class 9 Work and Energy Notes

Work and Energy Notes Work:- Work is said to be done if a force is applied on an object & it displaces in the direction of force applied. S.I. unit:- Joule (J) It is a scalar quantity. Work done = Force x displacement (W = FS) 1 Joule :- The work done on an object […]