# AST101H1 Lecture Notes - Lecture 8: Ellipse, Tidal Locking, Full Moon

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6 Oct 2016
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## Document Summary

If you add up the momentum of everything in a closed system you will find that no matter what happens, this momentum is conserved. Angular momentum: mass times velocity times distance. Acceleration due to gravity: downward velocity increases by about 10m/s with each passing second (gravity does not affect horizontal velocity, without air resistance, everything would accelerate at the same speed. This is why a feather or a piece of paper falls to the ground slower than a rock or. Weight a hammer: when you are in a state of free fall, you are weightless. It is not because they are so far away that earth"s gravity no longer affects them. There is nothing opposing the force of gravity. The astronaut is accelerating in an ellipse around the earth. It does (cid:374)ot depe(cid:374)d o(cid:374) the o(cid:271)je(cid:272)t"s (cid:373)ass, o(cid:374)ly the earth"s.

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