Asked by ABAINEH
. A stone slide on a horizontal surface. Which of the following will increase the magnitude of the friction force on it? A. Decrease the surface area of the contact B. Increase the surface area of the contact C. Putting second stone on top of it D. Decrease the mass of the stone
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Correct answer: C.
Reason: For dry (kinetic) friction F_f = μ_k N, and on a horizontal surface N = mg. Changing contact area (A or B) does not change μ_kN in the ideal model, so it has no effect. Putting a second stone on top increases the normal force (more mass) so F_f increases. Decreasing the stone's mass (D) lowers N and thus reduces the friction.
Reason: For dry (kinetic) friction F_f = μ_k N, and on a horizontal surface N = mg. Changing contact area (A or B) does not change μ_kN in the ideal model, so it has no effect. Putting a second stone on top increases the normal force (more mass) so F_f increases. Decreasing the stone's mass (D) lowers N and thus reduces the friction.
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