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Mechanics
Newton's second law -- rockets
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[QUOTE="Filip Larsen, post: 6866113, member: 237222"] The keyword here is "system". By considering both the propellant (initial at rest inside the rocket) and the rocket itself to be part of the system and then say this system is isolated we are effectively saying that the net force between the mass inside and any mass outside the system is zero, leaving us to consider only forces between mass inside the system. This then means the momentum of the system is unchanged, or equivalently, if one part of the system, e.g. some of the propellant, accelerate one way then another part, e.g. the rocket plus its remaining propellant, has to accelerate in the opposite direction. [/QUOTE]
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Newton's second law -- rockets
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