This site from How Things Work, by Lou Bloomfield, provides an explanation of why it can be hard to stop a bike with the rear brakes alone. The site contains a description of how friction and torque produce a rotation of the bicycle that makes the rear brakes ineffective.
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Keywords:force,NSDL,Undergraduate (Lower Division),friction,brake,Classical Mechanics,tire,traction,bike,Applications of Newton's Laws,Informal Education,Higher Education,torque,pressure,rotation,Physics,High School,NSDL_SetSpec_439869,Vocational/Professional Development Education,Rotational Dynamics,Technology,oai:nsdl.org:2200/20061121131853487T
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