P2207_fall10_lecture11

# P2207_fall10_lecture11 - C cos-1(kx/mg D cos(kx/mg The...

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What is the acceleration of a cyclist if he coasts without pedaling down Buffalo St.? (Neglect air resistance and any other forces from friction) a=? Aurora St. Eddy St. a=? A. g cos ( ) B. g sin ( ) C. g tan ( ) D. g / cos ( ) E. g / sin ( )

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How does your body detect acceleration? A. With the eyes B. With the ears C. With the stomach
Today: Forces Spring forces Springs in our bodies Solid on solid friction Static Friction

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By how much does the spring stretch from its relaxed length? k F F x=? A. x=F/2k B. x=F/k C. x=2F/k
The spring has stretched an amount x. What is the angle ? (Assume the surface on which the mass m slides is frictionless.) x k m =? A. sin -1 (kx/mg) B. sin (kx/mg)

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Unformatted text preview: C. cos-1 (kx/mg) D. cos (kx/mg) The spring has stretched an amount x. What is the acceleration a? (Assume the surface on which the mass m slides is frictionless.) k x a m a = ? A. a=-kx/m B. a=-k x m C. a=-kx D. Insufficient information Springs in our Bodies F-x relation for a gastrocnemius tendon: Force (N) Extension (mm) F-x relation for a foot arch: Force (N) Displacement (mm) Otolith Organ flexible tissue containing stretch-sensitive sensory cells (acts like spring) otolith (dense CaCO 3 ) fluid (provides damping) • All vertebrates have at least 2 or 3 in each ear • Measures orientation and acceleration. a flexible tissue otolith fluid Detecting orientation: Detecting acceleration:...
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P2207_fall10_lecture11 - C cos-1(kx/mg D cos(kx/mg The...

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