Question

The motion of a rocket is based on which of the following?
1. Law of Conservation of Momentum.
2. Law of Conservation of Angular momentum
3. Both (1) and (2)
4. None

Answer 1

Correct Answer - Option 1 : Law of Conservation of Momentum.

CONCEPT:

• Law of conservation of momentum state that If two objects collide, then the total momentum before and after the collision of the particle will be conserved.
  • Total momentum before collision = Total momentum after the collision
    m1​u1 + m2u2 = m1​v1 ​+ m2​v2

EXPLANATION:

• Rocket works on the principle of conservation of momentum.
• Rocket-propelled gases in a backward direction create momentum of the gases backward.
• Thus, by conservation of momentum, the rocket gets momentum in the forward direction, making it move forward.

• Momentum is the quantity of motion of a moving body, measured as a product of its mass and velocity.
  • It is also described as Linear Momentum.
  • Momentum is directly proportional to the object's mass and also its velocity.
  • In symbols, we can write as linear momentum is as p = mv
  • Thus the greater an object's mass or the greater its velocity, the greater its momentum.

The formula of momentum = mass × velocity.

so it's SI unit is.

 kg × m/s = kg m/s.​