Newton's Laws Of Motion - Practice Questions & MCQ

1. Newton’s second law of motion:-

• It states that the acceleration of the particle measured from an inertial frame is given by the (vector) sum of all the forces acting on the particle divided by its mass (only when mass is constant), i.e.,

• Impulse:

1.  The quantity   is known as the impulse of the force F during the time interval t₁ to t₂ and

Is equal to the change in the momentum of the body on which it acts,

i.e. ⇒ Area under force and time graph is an impulse.

             2.    Dimension- MLT-1

            3.    Unit- kg-m/sec

• Impulse Momentum Theorem- Newton’s 2nd law can also be written as:

                      Rate of change in momentum = Force Applied

   2.    Newton’s third law of motion:-

• It states that "If a body A exerts a force F on another body B, then B exerts a force (-F) on A." 

• Action and reaction never act on the same bodies.

3. Law of Conservation of Linear Momentum:

• As we know, , If F=0 then change in momentum=0 ⇒p=constant.

     ஃ p=p₁+p₂+p₃+......=constant