Two drivers traveling side-by-side at thesame speed suddenly see a deer in the road ahead of them and beginbraking. Driver 1 stops by locking up his brakes and screeching to ahalt; driver 2 stops by applying her brakes just to the verge of locking, so that the wheels continue to turn until her car comes to a complete stop. (a) All other factors being equal, is the stopping distance ofdriver 1 greater than, less than, or equal to the stopping distance ofdriver 2? (b) Choose the best explanation from among the following:I. Locking up the brakes gives the greatest possible braking force.II. The same tires on the same road result in the same force offriction.III. Locked-up brakes lead to sliding (kinetic) friction, which isless than rolling (static) friction
Two drivers traveling side-by-side at the
same speed suddenly see a deer in the road ahead of them and begin
braking. Driver 1 stops by locking up his brakes and screeching to a
halt; driver 2 stops by applying her brakes just to the verge of locking, so that the wheels continue to turn until her car comes to a complete stop. (a) All other factors being equal, is the stopping distance of
driver 1 greater than, less than, or equal to the stopping distance of
driver 2? (b) Choose the best explanation from among the following:
I. Locking up the brakes gives the greatest possible braking force.
II. The same tires on the same road result in the same force of
friction.
III. Locked-up brakes lead to sliding (kinetic) friction, which is
less than rolling (static) friction
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