Use the exact values you enter in previous answer(s) to make later calculation(s

Question

Use the exact values you enter in previous answer(s) to make later calculation(s).

A car travels at 47 mi/h when the brakes are suddenly applied. Consider how the tires of a moving car come in contact with the road. When the car goes into a skid (with wheels locked up), the rubber of the tire is moving with respect to the road; otherwise, when the tires roll, normally the point where the tire contacts the road is stationary. Assume the coefficients of friction between the tires and the road are
?K = 0.80 and ?S = 0.90.
(a) Calculate the distance required to bring the car to a full stop when the car is skidding.
m

(b) Calculate the distance required to bring the car to a full stop when the wheels are not locked up.
m

(c) How much farther does the car go if the wheels lock into a skidding stop? Give your answer as a distance in meters and as a percent of the nonskid stopping distance.
?xskid ? ?xno skid = m

?xskid
?xno skid
= %


(d) Can antilock brakes make a big difference in emergency stops? Explain.
because the stopping distance with antilock brakes is the stopping distance without antilock brakes.

Explanation / Answer

a) 28.125 m b) 25 m c) 3.125 m 12.5 % d) Yes. Because the stopping distance with antilock brakes is 11.11 % less than the stopping distance without antilock brakes.

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