(c) Now, the applied force F → indirectly increases the maximum possible value of friction (since its y component causes a reduction in the normal force) as well as directly opposing the friction force itself (because of its x component). The normal force in this case turns out to be F N = mg + F sin θ , where = 60º, so that the horizontal equation becomes F cos – f s,max = F cos – μ s ( mg + F sin θ ) = 0 320 N. F ¡ = 67. (a) To be “on the verge of sliding” means the applied force is equal to the maximum possible force of static friction (Eq. 6-1, with F N = mg in this case):
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.