PHYA10H3 Chapter Notes - Chapter 6: Friction, Contact Force, Dynamic Equilibrium
14 Oct 2016
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Chapter 6 dynamics i: motion along a line. Equilibrium - an object on which the net force is zero. The object might be: at rest in static equilibrium, or moving along straight line with constant velocity in dynamic equilibrium, net = 0 , = 0 . (cid:272)ala(cid:396) (cid:395)ua(cid:374)tit(cid:455) that des(cid:272)(cid:396)i(cid:271)es a(cid:374) o(cid:271)je(cid:272)t"s i(cid:374)e(cid:396)tia. Value is unique & will always be the same. Gravity - an attractive, long-range force btw any 2 objects. Ne(cid:449)to(cid:374)"s la(cid:449)s of g(cid:396)a(cid:448)it(cid:455): f1 on 2 = f2 on1 = (cid:2869)(cid:2870) (cid:3045)2, gravitational constant: g = 6. 67 x10-11 nm2/kg2. Force gets weaker as distance btw objects increases. Flat-earth approximation if the height above the surface is very small compared to size of pla(cid:374)et, the(cid:374) the (cid:272)u(cid:396)(cid:448)atu(cid:396)e of su(cid:396)fa(cid:272)e is (cid:374)ot (cid:374)oti(cid:272)ea(cid:271)le & the(cid:396)e"s al(cid:373)ost (cid:374)o diffe(cid:396)e(cid:374)(cid:272)e (cid:271)t(cid:449) (cid:396) a(cid:374)d pla(cid:374)et"s (cid:396)adius r. Fg =mg, g = 2 , a property of the planet. M = mass of e, r = radius of e.
