You need to think about this assignment a bit. Conversions are needed. The force of friction due to a single rolling wheel or tire is often stated as: Frol = Cr · N where Cr is the rolling resistance coefficient (no units) and N is the normal force. For one single typical car tire, C„ is about 0.015 and a car like a Toyota Camry weighs about 3000 pounds. Consider a Camry driving at constant velocity. The total force of friction acting on the car in Newtons is: Foel - Total Froll +(1.8 kg/m) v² where the second term is due to air resistance with y measured in m/s. 1. What is the magnitude in Newtons of Fotal When v = 55 miles/hr. 2. What is the magnitude in Newtons of Fjeeal When v = 70 miles/hr. 3. There has been much debate about a federal law mandating a speed limit of 55 miles/hr. There are many pros and cons to this argument. USING your answers above, describe a physics advantage to driving at 55 miles/hr instead of 70 miles/hr. The INCORRECT answer is that it's safer (it is NOT because it helps avoid crashes or that it's safer in a crash) since that has nothing to do with the force of friction that increases at 70 miles/hr.

You need to think about this assignment a bit. Conversions are needed. The force of friction due to a single rolling wheel or tire is often stated as: Frol = Cr · N where Cr is the rolling resistance coefficient (no units) and N is the normal force. For one single typical car tire, C„ is about 0.015 and a car like a Toyota Camry weighs about 3000 pounds. Consider a Camry driving at constant velocity. The total force of friction acting on the car in Newtons is: Foel - Total Froll +(1.8 kg/m) v² where the second term is due to air resistance with y measured in m/s. 1. What is the magnitude in Newtons of Fotal When v = 55 miles/hr. 2. What is the magnitude in Newtons of Fjeeal When v = 70 miles/hr. 3. There has been much debate about a federal law mandating a speed limit of 55 miles/hr. There are many pros and cons to this argument. USING your answers above, describe a physics advantage to driving at 55 miles/hr instead of 70 miles/hr. The INCORRECT answer is that it's safer (it is NOT because it helps avoid crashes or that it's safer in a crash) since that has nothing to do with the force of friction that increases at 70 miles/hr.