july def

• scalar quantity : A quantity that has only magnitude is called a scalar quantity.


  eg; length, mass, time, temperature, energy, distance, speed
• • Vector quantity : A quantity that has both magnitude and direction is called a vector quantity.


  eg; velocity, force, acceleration, weigh
• Speed : Speed is defined as the distance travelled per unit time.


  speed= distance/time
• • Velocity : Velocity is defined as the distance travelled per unit time in given direction.


  v=d/t (or) v= s/t
• Acceleration : Acceleration is change in velocity per unit time.



  a= change in velocity/time (or) a= v-u/t
• Newton's Second Law : The net external force acting upon a particle is equal to the product of the mass and the acceleration of the particle.



  F= ma
• v= u + at


  v² = u² + 2as

  s = ut + 1/2at²