lec04-203-08newton1mod

lec04-203-08newton1mod - -1a4-2Fa =mor F=ma F=m a 2mN=kg...

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Unformatted text preview: 4-14-14-1a4-2Fa =mor F=ma F=m a 2mN=kg sunitstoward the Earth’s center F = mgg = 9.8 m/s2Force of Gravity at Earth’s Surface4-2a4-2b4-2cFree bodydiagramN-2ndLawmP+mm2+TTP = m a a = Pm1PAsk a = ?a = P4-3Ask a = ?T=?1 mass 2 masses T = m2aP-T= m1aP-m2a= m1aP = m1a +m2a=(m1+m2) aT = m2P(m1+m2)(m1+m2)Free body diagramsN-2ndLawsFree body diagramN-2ndLawP(m1+m2) m2P+m1TTAsk T= ?T = m2a = m2m2TTm1PP = (m1+m2) a a = P(m1+m2) Now definesystemcarefully to solve specific question asked !!!system4-3aAsk a = ?system2 masses Internal forces (e.g. T) do not appear- only outside to inside forces.m2m3m1T1T2 = m3aT2T1T2PP = (m1+ m2+m3)a+T1-T2 = m2a(2)(3)(1)add (1)+(2)+(3) ⇒P-T1 = m1am2m3m1PP = (m1+ m2+m3) a = Ma+a = PMeasy wayvery hard wayAsk a = ?systemcarefully define “system” to attack question asked !!4-43 masses m2m3m1T1T2 = m3PT2T1T2PP = (m1+ m2+m3) a = Ma+a = PMT2 = m3aMAsk T2=?4-54-64-6a4-74-7a...
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lec04-203-08newton1mod - -1a4-2Fa =mor F=ma F=m a 2mN=kg...

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