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# L35 - Remember:ThisWeek CAPA assignment#12 is due this...

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Remember: This Week CAPA assignment #12 is due this evening at 10 PM, to be done on -line. Lab 5: Spring and Things. No prelab. Print lab manual and bring to lab session. Read Ch. 9: Statics & Static Equilibrium. Also fnish Ch. 8 on angular momentum. 9.1 Conditions For equilibrium 9.2 Solving statics problem 9.3 Applications to muscles and joints 9.4 Stability and balance Begin reading Ch. 10: ±luids. Ch 10.1 – 10.4. L35 W 4/9/10 1 Physics 2010

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L35 W 4/9/10 Physics 2010 2 Static Equilibrium : An object is (1) not translating (not moving up, down, left, right) (2) not rotating (not spinning CW or CCW). Not translating: F  net = 0 = F i i F x = F y = 0 (net force is zero) (each component of the net force is zero) τ net = 0 = i i (net torque is zero) Statics and Static Equilibrium Not rotating:
L35 W 4/9/10 Physics 2010 3 Statics and Static Equilibrium

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L35 W 4/9/10 Physics 2010 4 A bar has four forces, all of the same magnitude, exerted on it, as shown. What is the sign of the net torque about the axis of rotation? Use the sign convention shown. A) torque is zero C) negative (–)
L34 W 4/7/10 Physics 2010 5 F x = F y = 0 τ net = 0 = i i Statics and Static Equilibrium c.m. 0 = = + L T sin θ ( ) 3 4 L ( m S g ) 1 2 L ( m B g ) T = g (3 m S + 2 m B ) 4 sin Example 3.

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L34 W 4/7/10 Physics 2010 6 F x = F y = 0 τ net = 0 = i i
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L35 - Remember:ThisWeek CAPA assignment#12 is due this...

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