Map Map sapling earning A NASCAR racecar rounds one end of the Martinsville Spee

Question

Map Map sapling earning A NASCAR racecar rounds one end of the Martinsville Speedway. This end of the track is a turn with radius approximately 57.0 m. lf we approximate the track to be completely flat and the racecar is traveling at a constant 33.5 m/s (about 75 mph) around the turn, what is the racecars centripetal (radial) acceleration? Number m/s2 What is the force responsible for the centripetal acceleration in this case? O weight O normal O gravity O friction To keep from skidding into the wall on the outside of the turn what is the minimum coefficient of static friction between the racecar's tires and track? Number

Explanation / Answer

ac = v²/r

ac = 33.5² / 57.0

ac = 19.68 m/s²

friction between the tires and road surface :friction

= F(horiz) / F(vert)
= m(ac) / mg
= ac / g
= 19.68 / 9.81
= 2.007

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