NATS 1530 Lecture Notes - Lecture 5: Liquid-Propellant Rocket, Tsiolkovsky Rocket Equation, Apollo 12
4 Dec 2018
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Document Summary
Suppose that an asteroid with momentum p1 collides into another asteroid with momentum p2, causing both asteroids to break apart into hundreds of fragments. The total momentum of all the fragments after the collision (assuming that no energy is lost to heat, friction, etc) would be p1+p2: suppose that an astronaut at rest in space throws a tool in the forward direction. If an astronaut at rest in space throws a tool in the forward direction, the astronaut will be propelled backward. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but in the opposite direction on that system. The force applied on a surface in a direction perpendicular or normal to the surface is called thrust. Lift force arises from horizontal motion through air. The plane moves from the backward force by the engines. A plane can y vertical by a downward force by the engines.
