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Chapter05

# Chapter05 - Chapter 5 Applying Newton's Law 1 Using...

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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 0 F = r 0 x F = 0 y F =
One dimensional equilibrium. Consider an athlete hanging on a massless rope

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Two dimensional equilibrium
An inclined plane

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Tension over a frictionless pulley
2. Using Newton’s 2nd Law:     Dynamics of Particles Dynamics : the relationship of motion to the forces that cause it F ma = r r x x F ma = y y F ma = : 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: Σ F x =ma x , Σ F y =ma y 5. Solve for unknown parameter(s)
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.
Example 5.9) Apparent weight in an accelerating elevator. A 50.0

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Chapter05 - Chapter 5 Applying Newton's Law 1 Using...

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