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Chapter 6 Dynamics I : Motion along a Line

Chapter 6 Dynamics I : Motion along a Line. 6.1 Equilibrium 6.2 Using Newton’s Law 6.3 Mass and Weight 6.4 Friction 6.5*Drag 6.6 More Example of Newton’s Second Law. Equilibrium. Static Equilibrium V =0 Dynamic Equilibrium V = constant.

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Chapter 6 Dynamics I : Motion along a Line

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  1. Chapter 6 Dynamics I : Motion along a Line 6.1 Equilibrium 6.2 Using Newton’s Law 6.3 Mass and Weight 6.4 Friction 6.5*Drag 6.6 More Example of Newton’s Second Law

  2. Equilibrium • Static Equilibrium V =0 • Dynamic Equilibrium V = constant

  3. Stop to think 6.1 P157Stop to think 6.2 P162Stop to think 6.3 P165 Example 6.2 P 154 Example 6.4 P 156 Example 6.6 P 165 Example 6.9 P 171 Example 6.11 P 173

  4. Ex.1

  5. Ex. 2 With constant v

  6. Using Newton’s Second Law

  7. Mass and Weight • Weight • g=9.8 m/s2 • The magnitude of the weight force is directly proportional to the mass, with g as the constant.

  8. Mass and weight are not the same thing • Measurement weight A spring scale, such as the familiar bathroom scale Measures weight, not mass Fsp = Fg = w = mg, m = w/g

  9. Apparent weight Wapp= Fsp

  10. Apparent weight is the magnitude of the contact force that supports the object • When acceleration is upward • If elevator moves with constant velocity What is apparent weight? if elevator has acceleration downward What is apparent weight?

  11. Friction • Static friction • Notice the box remains the rest • An object remains at rest as long as • The object slips when Here μs is called Coefficient of static friction

  12. Kinetic Friction • Once the box starts to slide, the static kinetic friction force is replaced by a kinetic friction • Here μk is called the coefficient of kinetic friction

  13. Example 6.9 (p171)

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