Why are drag- racing tires wide and smooth, whereas passenger- car tires are narrower and have tread (Fig. 4.32)? Are there frictional and/ or safety considerations? Does this difference between the tires contradict the fact that friction is independent of surface area?
Answer to relevant QuestionsHow could you approximately determine the coefficient of kinetic friction between your shoes and a fairly smooth floor? A student weighing 600 N crouches on a scale and suddenly springs vertically upward. Will the scale read more or less than 600 N just before the student leaves the scale? A gun is fired and a 50-g bullet is accelerated to a muzzle speed of 100 m/s. If the length of the gun barrel is 0.90 m, what is the magnitude of the accelerating force? (Assume the acceleration to be constant.) When a horizontal force of 300 N is applied to a 75.0-kg box, the box slides on a level floor, opposed by a force of kinetic friction of 120 N. What is the magnitude of the acceleration of the box? A book is sitting on a horizontal surface. (a) There is (are) (1) one, (2) two, or (3) three force(s) acting on the book. (b) Identify the reaction force to each force on the book.
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