I remember my teacher saying that anti-lock brakes worked better

  • Thread starter Thread starter cragar
  • Start date Start date
  • Tags Tags
    Brakes Teacher
AI Thread Summary
Anti-lock brakes are more effective due to the higher static friction coefficient compared to kinetic friction, which allows for better control during braking. When brakes are applied, the goal is to maintain static friction to prevent wheel lock-up, enhancing vehicle stability. A simple experiment demonstrates this principle by comparing the angles at which an object begins to slide on a tilted surface under static and vibrating conditions. The results show that static friction (alpha) is greater than dynamic friction (beta), confirming that static conditions provide better grip. Understanding this difference is crucial for grasping how anti-lock braking systems improve safety and performance.
cragar
Messages
2,546
Reaction score
3
I remember my teacher saying that anti-lock brakes worked better because of the static friction coeffiecient was higher than the kinetic friction, but i never understood why. Is it beacuse when you stab the brakes their is a larger impulse?
 
Physics news on Phys.org


The static friction coefficient between the wheels and the ground is higher than the kinetic friction coefficient. It doesn't have anything to do with how hard you push on the pedals - it is typical of most static and kinetic friction situations.
 


carry out a simple experiment:
take an object ,keep it on a flat surface. Now start tilting the table SLOWLY. not down the angle with horizontal the surface makes at which the object just starts sliding. the this is alpha.
Now take a vibrating surface which continuously vibrates with a small amplitude. The vibration shall be in the horizontal direction and sufficiently rapid. Keep the object on it. tilt the surface. Note the angle again, say, beta.
compare alpha and beta.
you will find that alpha>beta. Why?
this is because coeff. of friction in static condition is more than than in dynamic condition.
 


thanks for the responses guys, so when I raise the plane and its vibrating the object will slide sooner.
 

Thread 'Average velocity as a weighted mean'

Hello everyone, Consider the problem in which a car is told to travel at 30 km/h for L kilometers and then at 60 km/h for another L kilometers. Next, you are asked to determine the average speed. My question is: although we know that the average speed in this case is the harmonic mean of the two speeds, is it also possible to state that the average speed over this 2L-kilometer stretch can be obtained as a weighted average of the two speeds? Best regards, DaTario
View full post »

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »

Similar threads

ABS system on a two-wheeled vehicle - Conservation of Angular Momentun
Replies
7
Views
1K
Car - brake locking, stopping distance
Replies
24
Views
5K
Torque produced by friction when braking in a car
Replies
2
Views
2K
What forces oppose a car's motion when braking?
Replies
8
Views
4K
Question about car braking and tire friction
Replies
19
Views
3K
Supose a car, going at a constant velocity
Replies
1
Views
1K
Rotational Dynamics - Modeling brake caliper deceleration of a chassis
Replies
10
Views
3K
Automotive Cancelling effects on a larger brake rotor
Replies
14
Views
2K
Airplane wings -- How do they work and why do they change shape?
2
Replies
81
Views
11K
Why are 2/3 of my brake lights required to work by law?
Replies
11
Views
2K

Hot Threads

Recent Insights

Back
Top