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On what factors does friction depend?

On what factors does friction depend?. How can we measure the force of friction between the block and the table?. Kinetic Friction < Static Friction. Once an object gets moving, friction get’s less. Regents Table of Coefficients of Friction. Example 1.

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On what factors does friction depend?

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  1. On what factors does friction depend?

  2. How can we measure the force of friction between the block and the table?

  3. Kinetic Friction < Static Friction Once an object gets moving, friction get’s less.

  4. Regents Table of Coefficients of Friction

  5. Example 1 Find the force of friction between a waxed ski sliding on snow when an 800 N skier is skiing horizontally. What if a skier half as heavy where on the same skis and snow?

  6. N = -Fy Fy =800 cos30 = 692N = N 800 Example 2: Downhill without friction (imaginary) If there were perfectly frictionless snow find the acceleration of an 800 N skier is skiingon a 30slope. Fx =800 sin30 = 400 N If W =800N = mg , then m = 80 kg Fnet = Fx = ma 400 = 80a so a = 5 m/s/s

  7. N = -Fy Fy =800 cos30 = 692N = N 800 Example 3: Downhill with friction Find the force of friction between a waxed ski sliding on snow when an 800 N skier is skiing on a 30 incline. Then find the skiers acceleration. N f=uN = .05 x 692 = 34N f 30 30 Fx =800 sin30 = 400 N W If W =800N = mg , then m = 80 kg Fnet = Fx – f = ma Fnet = 400– 31 = ma Fnet = 369N = 80a, so a = 4.58 m/s/s

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