# Dynamics - Normal and Tangential Motion

by aaronfue
Tags: dynamics, motion, normal, tangential
 P: 122 1. The problem statement, all variables and given/known data The tires on a car are capable of exerting a maximum frictional force of 1753 lb. If the car is traveling at 75 ft.s and the curvature of the road is ρ=560 ft, what is the maximum acceleration that the car can have without sliding? 2. Relevant equations ƩFn = man 3. The attempt at a solution Ff = 1753 lb v = 75 ft/s ρ=560 ft wcar = 3150 lb an = $\frac{v^2}{ρ}$ = $\frac{75^2}{560}$ = 10.04 ft/s2 I believe that the acceleration would be the magnitude of the tangential and normal acceleration. ƩFn = man = $\frac{3150}{32.2}$*10.04 = 982.2 lb 1753 = √Ft2 + 982.22 Solving for Ft = 1452 lb; Now solving for at → 1452 = $\frac{3150}{32.2}$*at at = 14.85 ft/s2 a = √at2 + an2 = √14.852 + 10.042 = 17.90 ft/s2 I'd appreciate it if someone could verify my work.
 P: 1,195 I get the same answer as you. I think the question is asking for the maximum tangential acceleration which is 10.04 ft/sec^2.
P: 122
 Quote by LawrenceC I get the same answer as you. I think the question is asking for the maximum tangential acceleration which is 10.04 ft/sec^2.
Tangential was actually 14.85 ft/s^2.

And it makes sense too.

Thanks.

P: 1,195
Dynamics - Normal and Tangential Motion

 Quote by aaronfue Tangential was actually 14.85 ft/s^2. And it makes sense too. Thanks.
I typed the wrong number.......should have typed 14.85 ft/s^2.

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