Rocket works on the principle of conservation of momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backwards and thus by conservation of momentum, the rocket gets momentum in the forward direction making it move forward.Thus the rocket works on the principle of conservation of linear momentum.

It states that an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by unbalanced force.

The dimensions of Force are M (mass), L (length) and T-2(time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2