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Unformatted text preview: • • • • • • • • • • – – – – • – – – – 3/4/11 3 • • • a=F net m • FA B = FB • – • • • – • • • • • T =k l • fA fA static f AmaxB = μ AB N A B B =μ kinetic μ AB kinetic AB NA B not sliding sliding B static μ AB • W= GmM R R2 mg A • • • • • • • • FS a= a= 1 net F m 2 0 F net = kx 2 0 x x(t ) = A cos( 2 0= T 0 t = k m ) Interpret! M FE M Measured from where? • • KE = 1 2 Work = F net mv 2 r • ( 1 2 ) mv 2 = F net r FS M FE M Measured from where? E = mv + mgh + k ( l ) 1 2 2 1 2 2 Ei = E f a= ( Fynet = T cos mg 1 net 1 F= T + mg m m net Fx = T sin ax = ay 1 T sin = m 1 0 = (T cos m Tx mL mg ) ) T mg g x ax = L ax = ax = g x L 2 0 2 0 x g = L What’s the period? Why doesn’t it depend on m? What does the energy look like in this case? • • • v0 = TL T = M μ • • • y = A sin kx • y = A sin k ( x v0t ) y = A sin( kx = kv0 kv0t ) = A sin( kx t) y = A sin( kx t) kv0 Fixed time: Wave goes a full cycle when kx : 0 2 2 x :0 k Fixed position: Wave goes a full cycle when t :0 t :0 2 2 T = kv0 ? Interpret =2 f = 2 T = kv0 k= 2f= f = v0 2 v0 or (famous wave formula) Interpret 1 = v0 T = v0T • • • • • n1 sin 2 1 = n2 sin 2 • • • – – • – – • – • – – – ...
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