Quick Question (1 Viewer)

[C20H25N3O]

can someone please explain the motion of a rocket when its increasing acceleration in terms of the law of conservation of momentum?

 

[Squar3root]

so when the rocket burns it's fuel and stuff it looses mass and then since F = ma, a will increase since m is decreasing

 

[C20H25N3O]

so when the rocket burns it's fuel and stuff it looses mass and then since F = ma, a will increase since m is decreasing

thank you,
p.s downloading your mx1 notes

 

[Squar3root]

 

[anomalousdecay]

When the rocket expels its gases, the gases will gain a momentum. Through the Law of Conservation of momentum, the rocket will gain momentum in the opposite direction of equal magnitude to the momentum of the gases.

Force is the rate of change in momentum. As the rocket becomes lighter as more and more gases are expelled, the speed of the rocket will start to increase (since p = mv, and p is reliant on the momentum of the gases as per the Law).

Hence the momentum of the rocket is increasing. As force is the rate of change in momentum, then the force on the rocket is increased. Now:

since F = ma, a will increase since m is decreasing

 

[dan964]

syllabus dotpoint View attachment 31385