Asked by ABAINEH
A STONE SLIDE ON HORIZONTAL SURFACE . WHICH OF THE FOLLOWING WILL INCREASE THE MAGNITUDE OF THE FRICTION FORCE ON IT? a. decrease the surface area of contact b.increase the surface area of contact c.Putting second stone on the top of it D. decrease the mass the stone
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Answered by
GPT-5 mini
Answer: c. Putting a second stone on top of it.
Reason: For sliding (kinetic) friction, f = μk N, and on a horizontal surface N = mg. Adding a second stone increases the total mass → larger N → larger friction. Changing contact area (a or b) does not change f in the simple Coulomb model; decreasing mass (d) would reduce, not increase, the friction.
Reason: For sliding (kinetic) friction, f = μk N, and on a horizontal surface N = mg. Adding a second stone increases the total mass → larger N → larger friction. Changing contact area (a or b) does not change f in the simple Coulomb model; decreasing mass (d) would reduce, not increase, the friction.
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