P2207_fall10_lecture27

P2207_fall10_lecture27 - Lecture 27 Today Static...

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Lecture 27
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Today: Static Equilibrium Levers in Kitchen Utensils Forces in lifting, torques exerted by muscles, and how to throw a ball at 50 m/s
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F 1 L 2 L 1 F 2 pivot For rotational equilibrium, F 2 /F 1 = ? A. 1 B. -1 C. L 1 /L 2 D. L 2 /L 1
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Levers in Kitchen Utensils: L 1 L 2
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L 1 L 2 Typical mechanical advantage : F 2 /F 1 =L 1 /L 2 : ~ 5 Maximum hand grip force: ~ 10 - 200 lb Maximum utensil force: ~ 50 - 1000 lb Levers in Kitchen Utensils:
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A car with weight W has a distance of 3 m between its front and rear wheels . Its center of gravity is 1.2 m behind the front wheels . What is the total force exerted on the two front wheels by the ground? 3 m 1.2 m A. 0.4 W B. 0.5 W C. 0.6 W D. 1.0 W
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1 m 0.1 m 0.1 m 2 m x y A gate of uniform mass distribution and weight W is supported by two hinges as shown. The y component of the hinge force is the same for both hinges. In what direction is the force exerted on the gate by the top hinge ?
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P2207_fall10_lecture27 - Lecture 27 Today Static...

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