Acceleration on a curve for a car

In summary, the conversation discusses the concept of a car tilting or flipping outside of a circle track when accelerating on a curve at a certain speed. The equations and calculations involved in determining the maximum side force and acceleration of the car are also mentioned. The importance of considering factors such as friction and the car's speed in the calculations is emphasized.
  • #1
ahchonx
4
0

Homework Statement



As we know, if a car accelerate on curve at certain speed, it will tilt outside the circle track. So i sketch this 2 picture to show how (for me) it works.

http://img193.imageshack.us/img193/2323/66057246.jpg
http://img194.imageshack.us/img194/9272/96495741.jpg

I just wondering, how can the car tilt or flip outside the circle track if the side force (centripetal force) is pointing inside the circle?

Homework Equations



My suggestion:
Total Moment about tyre (2); ∑M2=0

The Attempt at a Solution



So, Fs*h + G*b/2 - FN1*b = 0

I assume that FN1=0 since the car is about to tilt about tyre (2). So here come the problem.

Fs = - G*b / 2h.

The minus sign shows that the side force, Fs, should point outside the circle.

Any comments?
 
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  • #3
Thanks LowlyPion.

So, what I understand from the link u gave me, the friction force should be act towards the centre of the circle and the side force towards outside?

In other words, friction = centripetal and side force = centrifugal ("effective") force?
 
  • #4
Hi there,

You might want to forget about centrifugal force in your equations, since it is an imaginary force. The equation of a car winding around a curve, at a constant speed, would looke more like this:
[tex]\sum F = ma_{cent}[/tex]
[tex]\text{friction} = m \frac{v^2}{R}[/tex]

Cheers
 
  • #5
Thanks fatra2,

The main purpose for me doing this calculation is to get maximum tangential acceleration of the car, since the car is not traveling on the curve with constant speed.

For that, I need to calculate first the maximum side force Fs (the speed and radius is not given). So I use this method to determine the maximum side force without taking the speed and the radius into account.

After I get the side force Fs, I add it to F1 to get the resultant force.

Fres = √(〖F_1〗^2+〖Fs max)〗^2 )

And then, the resultant force should be equal or less than the friction force in x and y-axis (in the picture above, the yellow circle indicate that firction).

Fres ≤ F_μH
(m.a)^2+〖Fs max)〗^2 ≤〖F_μH〗^2

F_μH and m are known. Fs max is also known from the previous calculation. Hence, I get the maximum acceleration,

a_max = √(〖F_μH〗^2-〖Fs max〗^2 )/m

Is my method correct?
 
  • #6
Hi there,

If the speed of the car is not constant, the problem gets more complicated. The basic equation stays the same:
[tex]\sum \vec{F} = m \frac{d^2\vec{r}(x,y)}{dt^2}[/tex]

For which the friction will act in both direction (x,y). Since the car accelerates, the motor develop traction on the wheels, which in turn develop backward friction on the road, which makes the car go forward.

I guess you don't want to have the car spinning and skidding on the road, so you can assume only static friction. But the value [tex]f=\mu N[/tex] gives the maximal scalar value of the friction. If the case is where you are far from spinning and skidding, then the value can take a lower value than that.

I am sorry to complicate your porblem, but if you want to have a correct solution, you should not overlook anything. Cheers
 

Related to Acceleration on a curve for a car

1. What is acceleration on a curve for a car?

Acceleration on a curve for a car refers to the rate at which the car's speed increases or decreases while turning. It is affected by factors such as the car's speed, the angle of the curve, and the friction between the tires and the road.

2. How does acceleration on a curve affect a car's handling?

Acceleration on a curve can significantly impact a car's handling. If the acceleration is too high, the car may lose traction and slide off the road. On the other hand, if the acceleration is too low, the car may not be able to make the turn efficiently, causing it to slow down and potentially lose control.

3. What is the relationship between acceleration and centripetal force on a curved road?

Acceleration and centripetal force are directly related on a curved road. As a car accelerates, it generates a centripetal force that pulls it towards the center of the curve. This force is essential for keeping the car on the road and preventing it from sliding off.

4. How can a car's acceleration on a curve be improved?

A car's acceleration on a curve can be improved by increasing the friction between the tires and the road. This can be achieved by using tires with better traction, maintaining proper tire pressure, and driving at an appropriate speed for the curve's angle.

5. What safety precautions should be taken when driving on a curved road?

When driving on a curved road, it is crucial to maintain a safe speed and avoid sudden changes in acceleration. It is also essential to keep a safe distance from other vehicles and be aware of any potential hazards, such as debris or wet road conditions. Additionally, always follow the posted speed limit and use caution when entering and exiting curves.

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