Question

i) A heavy and light object have same momentum which of these is traveling faster? ii) State the law of conservation of momentum. Give one example?

Answer 1

Ans i)

Since , momentum = mass × velocity

ATQ, the both the heavier and lighter object have same momentum , it means that the lighter object is moving more faster than the heavier object .

Ans ii)

Law of conservation of momentum states that

for two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor be destroyed.

Example: Bullet fired from a gun.

Answer 2

Answer:

(i) Light object is travelling faster.

(ii) The total momentum of a system before and after any event remains constant when no external force is applied to it.  Example: Firing bullet from gun.

Explanation:

(i) Momentum: Momentum is the product of mass and velocity.

   Momentum(p) = mass(m) × velocity(v).

   As momentum of two objects are same, then we can write

    mass(m) × velocity(v) = constant

    velocity = $\frac{constant}{mass}$  or velocity ∝ $\frac{1}{mass}$

   If mass of an object is increased then velocity will decrease.

   So the heavy object moves with less velocity and light object moves with more velocity.

  ∴ Light object is travelling faster.

(ii) Law of conservation of momentum: The total momentum of a system before and after any event remains constant when no external force is applied to it.

Example: Firing bullet from gun - in this case total momentum of bullet and gun before firing and after firing remains same. That's why the gun moves in backward direct at the time of firing.

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