ef152-lec-2-2

# ef152-lec-2-2 - 1 8 m 56 kg 2 5 EF 152 Spring 2009 Lecture...

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EF 152 Spring, 2009 Lecture 2-2 1 Module 2, Lecture 2 •S t a t i c s , F BD •S t a b i l i t y How much does the Leaning Tower of Pisa lean? A. 1° B. 2° C. 3° D. 4° E. 5° EF 152 Spring, 2009 Lecture 2-2 2 Example: Ladder Leaning Against a Wall Given: A ladder leans against a frictionless wall. Required: Angle between ladder and ground when it starts to slip. Moment of N W about base is: A. Positive B. Negative Moment of N W about base is: A. N W L B. N W Lsin θ C. N W Lcos θ D. N W Ltan θ E. N W Lsin θ + N W

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Unformatted text preview: 1 . 8 m 56 kg 2 5 EF 152 Spring, 2009 Lecture 2-2 4 Example: Step Ladder 56 kg EF 152 Spring, 2009 Lecture 2-2 5 Stability If an object is in equilibrium, and given a small displacement, there are three possibilities: • _______ equilibrium: object returns to original position • Example: ball hanging from a string • __________ equilibrium: object moves further away from original position • Example: pencil balanced on point • _________ equilibrium: object stays at new position • Example: sphere on a flat table Neutral Unstable Stable EF 152 Spring, 2009 Lecture 2-2 6 Example: Stability A truck is parked on an inclined road as shown. Determine the slope of the road that causes the truck to tip over. Center of mass θ 2.4 m 1.6 m 2.2 m...
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ef152-lec-2-2 - 1 8 m 56 kg 2 5 EF 152 Spring 2009 Lecture...

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