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Unformatted text preview: Chapter 5 : Applying Newton’s Law 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 Two dimensional equilibrium An inclined plane 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 : Newton’s 2nd Law, vector form : Newton’s 2nd Law, component form 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) Beware incorrect freebody diagram 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 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? Free body diagram of a mass in the slope Example 5.13) Find the acceleration 3. Frictional Forces3....
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This note was uploaded on 10/04/2011 for the course PHYS 2305 taught by Professor Tschang during the Spring '08 term at Virginia Tech.
 Spring '08
 TSChang
 Physics, Centrifugal Force

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