Physics Grade -9(New Course )
Unit -7 Force and Motion Force : - A physical quantity which change the state of an object is called force. Its S.I. unit (N) and measured by spring balance . It is a vector quantity . Eg. Pulling force, Gravitational force etc . Force(F)= Mass(m) × acceleration(a) or mass(m )× acceleration due to gravity (g) 1N force : - The force which when acting on a body of mass 1kg to produces 1m/s 2 acceleration is called 1 N force . 1 N = 10 5 dynes 1 dyne force :- The force which when acting on a body of mass 1gm to produce 1m/ 2 acceleration is called 1dyne force . Dyne =gcm/s 2 Relation between Newton and dynes....