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Force & Motion

Force & Motion. Chapter 6. Outline: Friction (Static and kinetic). The Drag force and Terminal Speed. Uniform Circular Motion. N. W. N. W. Force and Motion. Stationary Block:. Applying a small force F:. f s. F. Increasing F:. N. F y. f s. F x. W. F.

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Force & Motion

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  1. Force & Motion Chapter 6 • Outline: • Friction (Static and kinetic). • The Drag force and Terminal Speed. • Uniform Circular Motion. Physics 141-Chapter 6

  2. N W N W Force and Motion Stationary Block: Applying a small force F: fs F Increasing F: Physics 141-Chapter 6

  3. N Fy fs Fx W F Static Forces of friction Physics 141-Chapter 6

  4. f fs,max fk • Fx Fx = fs,max Kinetic Forces of friction Kinetic Forces of friction Physics 141-Chapter 6

  5. Example 1: Determining the coefficient of static friction fs N W sin( ) W W cos(  ) Physics 141-Chapter 6

  6. N W sin( ) fk W cos( ) W Example 2: A block slides on a rough incline Physics 141-Chapter 6

  7. F m1 no friction Friction m2 Example 3 Two blocks on top of each other 1) Find max applied Force F such that the two blocks move together. 2) If F =60 N, Find the acceleration of the blocks Physics 141-Chapter 6

  8. F Example 4 A block pushed against a vertical wall m1 Find max applied Force F such that the block will not slide down the wall Physics 141-Chapter 6

  9. Solution A block pushed against a vertical wall fs,max F m1 N W Physics 141-Chapter 6

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