PSC 1121 Lecture Notes - Lecture 8: Ellipse, Hyperbola
Document Summary
Part 1: gravity: kepler"s la(cid:449)s, ne(cid:449)to(cid:374)"s gra(cid:448)itatio(cid:374) la(cid:449, tidal forces & tides. Ellipse: has the property for any point of the ellipse, the sum of the distances from the foci is always the same. Ne(cid:449)to(cid:374)"s u(cid:374)i(cid:448)ersal la(cid:449) of gra(cid:448)itatio(cid:374)al attractio(cid:374): f=g * m1m2/d^2, g = 6. 67 x 10^-11 n m^2/kg^2. It"s a co(cid:374)sta(cid:374)t of gra(cid:448)itatio(cid:374)al attractio(cid:374: our weight is the sum of a lot smaller attractive forces between our body and parts of the earth. Tides: an effect from gravity on large objects: different parts of the earth feel different pull from the moon because they are at different dista(cid:374)ces fro(cid:373) it.
