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Phys205A_Lecture12

Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Chapter 5 Applications of Newton’s Laws Lecture 12

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Applications of Newton’s Law z The Particle in Equilibrium z The Particle under a Net Force z Friction Forces
Particles in Equilibrium z If the acceleration of an object that can be modeled as a particle is zero, the object is said to be in equilibrium z The model is the particle in equilibrium model z Mathematically, the net force acting on the object is zero 0 0 and 0 = = = r x y F F F

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Equilibrium, Example 1 z A lamp is suspended from a chain of negligible mass z The forces acting on the lamp are z the downward force of gravity z the upward tension in the chain z Applying equilibrium gives 0 0 = = = y g g F T F T F
Equilibrium, Example 2 z Conceptualize the traffic light z Assume cables don’t break z Nothing is moving z Categorize as an equilibrium problem z No movement, so acceleration is zero z Model as a particle in equilibrium

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Equilibrium, Example 2 z Analyze z Need two free-body diagrams z Apply equilibrium equation to the light z Apply equilibrium equations to the knot
Equilibrium, Example 2 z Finalize z Think about different situations and see if the results are reasonable

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