lec11 - P112 Lec11 Feb13,2008 FreebodyDiagrams

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P112 Lec 11 Feb 13, 2008
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Free body Diagrams As the basis for statics and dynamics problems, we need to introduce “ Free Body Diagrams Rules: isolate the body and identify all forces acting on it Draw body as a dot and draw the force vectors with their tail on the dot Identify the force with a symbol – Label the forces carefully as F AonB (“Force exerted by A on B”)
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Label forces by symbol Normal forces (N) Always perpendicular to supporting surface Contact force Friction forces (f) acting opposite to movement (more in Friday’s lecture) Contact force Weight (W) Force of gravitational attraction Always toward center of the earth Tension (T) Exerted by ropes, springs,… Contact force Buoyancy, drag,… See next week
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Example for FBDs: Person pushing against a heavy box without moving it. Draw the FBDs for box and person.
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Solution N GonP f GonP F BonP W EonP N GonB F PonB f GonB W EonB Box Person
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More FBDs 1. Basketball player during a jump 2. Block on a wedge (not moving) 3. Child on a swing 4. Weight hanging on a spring
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Tools: Pulleys and Strings
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lec11 - P112 Lec11 Feb13,2008 FreebodyDiagrams

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