Banked curves, coefficient of friction problem

In summary, a car traveling on a road with a radius of 74.8 m needs a minimum coefficient of static friction in order to navigate a banked curve at a speed of 21.1 m/s without slipping. The angle was found using the equation (v^2)/gr, but the coefficient of static friction still needs to be determined. A free-body diagram is recommended, with the resultant of all forces being equal to the centripetal force.
  • #1
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Homework Statement



A road with a radius of 74.8 m is banked so that a car can navigate the curve at a speed of 15 m/s without any friction. When a car is going 21.1 m/s on this curve, what minimum coefficient of static friction is needed if the car is to navigate the curve without slipping?

Homework Equations





The Attempt at a Solution



I figured out the angle by doing (v^2)/gr but I don't know how to find the coefficient of static friction. PLEASE HELP!
 
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  • #2
Draw a free-body diagram. The resultant of all forces has to be equal to the centripetal force. ehild
 

What is a banked curve?

A banked curve is a curved section of a road or track that has been designed to allow vehicles to travel at high speeds without losing control. It is angled inward towards the center of the curve, creating a slope that helps to keep the vehicle on the road.

Why are banked curves used?

Banked curves are used to allow vehicles to maintain a constant speed while navigating a curve. The inward slope of the curve helps to counteract the centrifugal force that would cause the vehicle to slide off the road if the curve was flat.

What is the coefficient of friction?

The coefficient of friction is a measurement of the amount of friction between two surfaces. In the context of banked curves, it is the amount of friction between the tires of a vehicle and the road surface. It is denoted by the symbol "μ" and is typically a decimal number between 0 and 1.

How does the coefficient of friction affect a banked curve?

The coefficient of friction plays a crucial role in determining the maximum speed at which a vehicle can safely navigate a banked curve. A higher coefficient of friction means that there is more grip between the tires and the road, allowing the vehicle to travel at higher speeds without slipping off the curve. A lower coefficient of friction would require the curve to be less steep in order to maintain control.

How is the coefficient of friction calculated for a banked curve?

The coefficient of friction for a banked curve can be calculated using the formula μ = tanθ, where μ is the coefficient of friction and θ is the angle of the banked curve. This calculation assumes that the curve is perfectly banked and that the vehicle is travelling at a constant speed. In real-world scenarios, other factors such as the condition of the road and the weight of the vehicle may also affect the coefficient of friction.

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