chapter 8-1

# chapter 8-1 - CEE/ME 241 FRICTION(Sections 8.1 8.2 Today's...

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CEE/ME 241 Lecture Notes for Sections 8.1-8.2 1 FRICTION (Sections 8.1 - 8.2) Today’s Objective : Students will be able to: a) Understand the characteristics of dry friction. b) Draw a FBD including friction. c) Solve problems involving friction. In-Class Activities : Check homework, if any Reading quiz Applications Characteristics of dry friction Problems involving dry friction Concept quiz Group problem solving Attention quiz READING QUIZ 1. A friction force always acts _____ to the contact surface. A) normal B) at 45° C) parallel D) at the angle of static friction 2. If a block is stationary, then the friction force acting on it is ________ . A) ≤µ s N B) = µ s N C) ≥µ s N D) = µ k N

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CEE/ME 241 Lecture Notes for Sections 8.1-8.2 2 APPLICATIONS In designing a brake system for a bicycle, car, or any other vehicle, it is important to understand the frictional forces involved. For an applied force on the brake pads, how can we determine the magnitude and direction of the resulting friction force? APPLICATIONS (continued) Consider pushing a box as shown here. How can you determine if it will slide, tilt, or stay in static equilibrium? What physical factors affect the answer to this question?
CEE/ME 241 Lecture Notes for Sections 8.1-8.2 3 CHARACTERISTICS OF DRY FRICTION (Section 8.1) Friction is defined as a force of resistance acting on a body which prevents or retards slipping of the body relative to a second body. Experiments show that frictional forces act tangent (parallel) to the contacting surface in a direction opposing the relative motion or tendency for motion. For the body shown in the figure to be in

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chapter 8-1 - CEE/ME 241 FRICTION(Sections 8.1 8.2 Today's...

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