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chapter 8-2

# chapter 8-2 - CEE/ME 241 WEDGES AND BELTS Today's...

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CEE/ME 241 Lecture Notes for Sections 8.3,8.5 1 WEDGES AND BELTS Today’s Objectives : Students will be able to: a) Determine the forces on a wedge. b) Determine the tensions in a belt. In-Class Activities : Check homework, if any Reading quiz Applications Analysis of a wedge Analysis of a belt Concept quiz Group problem solving Attention quiz READING QUIZ 1. A wedge allows a ______ force P to lift a _________ weight W. A) (large, large) B) (small, small) C) (small, large) D) (large, small) 2. Considering friction forces and the indicated motion of the belt, how are belt tensions T 1 and T 2 related? A) T 1 > T 2 B) T 1 = T 2 C) T 1 < T 2 D) T 1 = T 2 e µ W

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CEE/ME 241 Lecture Notes for Sections 8.3,8.5 2 APPLICATIONS Wedges are used to adjust the elevation or provide stability for heavy objects such as this large steel vessel. How can we determine the force required to pull the wedge out? When there are no applied forces on the wedge, will it stay in place (i.e., be self- locking) or will it come out on its own? Under what physical conditions will it come out? APPLICATIONS (continued) Belt drives are commonly used for transmitting power from one shaft to another. How can we decide that the belts will function properly, i.e., without slipping or breaking?
CEE/ME 241 Lecture Notes for Sections 8.3,8.5 3 APPLICATIONS (continued) In the design of a band brake, it is essential to analyze the frictional forces acting on the band (which acts like a belt). How can we determine the tensions in the cable pulling on the band? How are these tensions, the applied force P and the torque M, related? ANALYSIS OF A WEDGE A wedge is a simple machine in which a small force P is used to lift a large weight W. To determine the force required to push the wedge in or out, it is necessary to draw FBDs of the wedge and the object on top of it. It is easier to start with a FBD of the wedge

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chapter 8-2 - CEE/ME 241 WEDGES AND BELTS Today's...

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