Chapter05 - Chapter5:Applying NewtonsLaw 1...

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Chapter 5 : Applying  Newton’s Law
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1. Using Newton’s 1st Law :  Particles in Equilibrium Until Chapter 9, we treat an object as a point particle: Rotational motion is not taken into account. Particle in equilibrium
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Two dimensional equilibrium
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An inclined plane
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Tension over a frictionless pulley
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2. Using Newton’s 2nd Law:     Dynamics of Particles Dynamics : the relationship of motion to the forces that cause it : Newton’s 2nd Law, vector form : Newton’s 2nd Law, component form
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Dynaics : Problem Solving Strategy 1. Draw a free body diagram. In doing so, identify all the forces. 2. Guess the direction of an acceleration. 3. Choose a coordinate system. 4. Set up equations using Newton’s 2 nd Law: ΣF x =ma x , ΣF y =ma y 1. Solve for unknown parameter(s)
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Beware incorrect free-body diagram
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Example 5.8) An elevator has a total mass of 800 kg. Originally moving downward at 10.0 m/s stops after 25.0 m down. Find the tension of the cable.
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Example 5.9) Apparent weight in an accelerating elevator. A 50.0 kg woman stands on a scale while riding in the elevator with an acceleration of 2.00 m/s 2 . What is the reading on the scale?
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Free body diagram of a mass in the slope
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Example 5.13) Find the acceleration
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3. Frictional Forces
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