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Laws Of Motion


  • Inertia


  • The property of a body to resist any change is called inertia e. g. when a horse starts suddenly, the rider falls backwards due to the inertia of rest of the upper part of his body.


  • Newton’s First Law

    • Every body continues to be in its state of rest or uniform motion in a straight line, unless compelled by some external force acting on it.
    • Example: Any object continues lying where it is, unless it is moved.
    • Newton’s first law gives the definition of Inertia.



  • Momentum of a body is the product of its mass, m and velocity, v, and is denoted by P.
  • It is a vector quantity.

  • SI unit → kg ms−1

Newton’s Second Law of Motion

  • The rate of change of linear momentum of a body is directly proportional to the external force applied on the body, and this change takes place always in the direction of force applied.

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