MECHANICAL SYSTEMS Motion With Friction (P )

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Presentation transcript:

MECHANICAL SYSTEMS Motion With Friction (P .52-54) SPH4C COLLEGE PHYSICS MECHANICAL SYSTEMS Motion With Friction (P .52-54)

Motion With Friction

Motion With Friction

Coefficient of Friction

Coefficient of Friction

Coefficient of Friction – Kinetic & Static NOTE! Determining the coefficients of friction for various surfaces can only be done experimentally. Even with careful control of other variables, results obtained are often inconsistent.

Coefficient of Friction – Kinetic & Static

Analyzing Motion With Friction PRACTICE 1. Which type of road, asphalt or concrete, provides better traction (friction of a tire on a road) for rubber tires under: (a) dry conditions? L :K asphalt = 1.07 and :K concrete = 1.02 (a) asphalt (since :K asphalt > :K concrete when dry) (b) wet conditions? L :K asphalt = 0.95 and :K concrete = 0.97 (b) concrete (since :K asphalt < :K concrete when wet)

Analyzing Motion With Friction PRACTICE 2. Determine the appropriate coefficient of friction in each case. (a) It takes 59 N of horizontal force to get a 22 kg leather suitcase just starting to move across a floor. (a) :S = 0.27 (b) A horizontal force of 54 N keeps the suitcase in (a) moving at a constant velocity. (b) :K = 0.25

Analyzing Motion With Friction PRACTICE 3. A 73 kg hockey player glides across the ice on skates with steel blades (:K = 0.010). What is the force of friction acting on the skater? Ff = 7.2 N

Analyzing Motion With Friction PRACTICE 4. A worker of a moving company places a 252 kg trunk on a piece of carpeting and slides it across the floor at a constant velocity by exerting a horizontal force of 425 N on the trunk. (a) What is the coefficient of kinetic friction? (a) :K = 0.17 (b) What happens to the coefficient of kinetic friction if another 56 kg trunk is placed on top of the 252 kg trunk? (b) nothing – the two objects in contact have not changed

Analyzing Motion With Friction PRACTICE 5. A 0.17 kg hockey puck slides along the ice at 19 m/s[E] when it hits a rough patch of ice that is 5.1 m across. Assume the coefficient of kinetic friction between the puck and the rough ice is 0.47. (a) Draw a FBD of the puck moving on the rough ice. (b) Calculate the kinetic friction acting on the puck. (b) Fk = 0.78 N[W] (c) Determine the puck’s average acceleration while on the rough ice. (c) a = 4.6 m/s2[W]

Check your Understanding TEXTBOOK P .54 Q.3-5 WEEBLY (MECHANICAL SYSTEMS) QUIZ1 (Fg & Friction)