Work, Power and Energy Class 9 Notes Science Chapter 11 Facts that Matter Work: When a force acts on an object and the object shows displacement, the force has done work on the object. Two conditions need to be satisfied for work to be done: (i) A force should act on object (a) The object [...]
Structure of the Atom Class 9 Notes Science Chapter 4 CBSE Class 9 Science Notes Chapter 4 Structure of the Atom Facts that Matter John Dalton assumed that atom is indivisible. In 1866 E. Goldstein discovered the presence of new radiations in a gas discharge tube and called them canal rays. These rays were positively [...]