lecture24

# lecture24 - Static Conditions of Equilibrium: Ftot 0 tot 0...

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Static Conditions of Equilibrium: 0 0 tot tot F 0 0 0 0 0 0 z y x z y x F F F 0 0 a Static Equilibrium: 0 0 v

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1m 1m 1kg 2kg Not in equilibrium 2m 1m 1kg 2kg In equilibrium Example: Equilibrium and torque 2 2 1 1 2 1 2 1 0 l F l F  2 2 1 1 2 1 2 1 0 l F l F
When d = 20 cm, the scale reads 2 lb exactly. If L = 1 m, How big is your turkey? Turkey Light rod Scale d L f 1 f 2 P 0 3 2 1 W 0 1 L f Wd  lb m m lb d L f W 10 2 . 0 1 2 1 Example: You bought a turkey and forgot how many pounds it was. All you have is a tiny kitchen scale that can weigh a maximum of 2 lb. But here’s good trick you can use to get an estimation. How you can do it? Use static equilibrium!

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Example: As shown below, one end of a uniform road with a weight of 400 N is attached to a wall. The other end of the rod is supported by a wire. What is the tension in the wire? φ =30° mg  N N mg T L mg TL tot 346 400 0 60 sin 2 / 30 sin 0 2 73 . 1 2 3 φ φ θ θ θ = φ + φ = 60° 2 3 2 1 60 sin 30 sin φ =30° mg φ φ θ θ T T Tcos30°
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## This note was uploaded on 10/21/2010 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.

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lecture24 - Static Conditions of Equilibrium: Ftot 0 tot 0...

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