What is Braking: Definition and 197 Discussions

Does anyone know of a pneumatic regenerative braking system (applied to any type of vehicle)?

Homework Statement Zach, whose mass is 78 kg, is in an elevator descending at 11 m/s. The elevator takes 3.2 s to brake to a stop at the first floor. What is Zach's weight before the elevator starts braking? What is Zach's weight while the elevator is braking? Homework Equations...

Homework Statement How much pressure must be exerted by the braking system of a car weighing 3000 lb, if you want to stop it from 40 mph to 0 in 1.5 seconds? Assume the total braking surface of the four wheels is 96 in^2. How much force must be exerted by your foot on the brake pedal in the...

Hi, Please help me with this problem: Suppose a round steel bar of 25 mm diameter and 72 m lengh, which is traveling at 3.7 m/sec. I need to know which is the distance needed for the bar to brake by frictioning against a flat steel surface. Coefficient of friction is 0.3 and density of...

Homework Statement a car is exerting 3.000N of force on a hill that rises 3m for each 100m of road. what is the actual weight of the car? how much force do the brakes have to exert to keep the car from rolling down the hill. Homework Equations a2 + b2 = c2 sin theta= opp/hyp cos...

Homework Statement "A bread truck is traveling at 18 m/s on a horizontal road. The brakes are applied and the truck skids to a stop in 3.6s. The coefficient of kinetic friction between the tires and the road is:" Homework Equations Kinetic Friction = coefficient of kinetic friction x...

I am just curious, but what is the average efficiency of Regenerative braking? As in... How much of the kinetic energy are they able to convert back to electrical?

I'm trying to find out how to see if my brakes will lock up or my tires will continue to roll through the following scenario. I have a machine that weighs 42,000 lbs. I'm pulling a 110,00 lbs trailer with load (no brakes on the trailer). This is a rubber tired machine going down a 8 degree...

Hello all :) I'm doing some coursework on eddy current braking atm and I just need to clarify that I have the right idea about how the concept works. Right, I know that when a conductive plate passes through the poles of a magnet, the change in magnetic flux induces eddy currents in the...

I understand that it happens when you move a magnet across the surface of a conductive non-magnetic metal like aluminum or copper because of magnetic eddies explained by Lenz's Law. What I don't understand is where the energy of the momentum is going. If I were pushing a magnet across an...

To brake a 3ph DC, the best I've come up with, apparently, is to place a pair of power FETS, back-to-back across each pair of leads. I would like to manage a hard short without additional load beyond the motor winding resistance, then duty cycle to get controlled braking. As far as having...

Homework Statement A certain automobile can decelerate at |a1| = 1.6 m/s2. Traveling at a constant v1 = 29 m/s, this car comes up behind a car traveling at a constant v2 = 4 m/s. How close to the slower car can the driver of the faster car come before applying his brakes and still avoid a...

Hi, I would like to know "how the braking system in a car can be modeled" i.e.,upon applying the force on pedal,how the force gets applied on the tires of the car.Please also give the equations which need to be considered for developing the model. Thank you.

so lost! help! Homework Statement The brakes of an 800-kg car exert a force of 4.4kN. (a) how long will the brake take to slow the car to a stop from an initial speed of 34m/s Homework Equations The Attempt at a Solution

Homework Statement driver slams breaks. car slows with acceleration of -5.6m/s^2 for 4.20s for 62.4m. Homework Equations with wat speed does the car then strike an object? The Attempt at a Solution i thought of using equation Xf=Xi+Vi(t)+1/2at^2 i am not sure if this is the...

Hi all, my first post on forums. How do i, ie what is the forumla, to calculate braking distance, for example; If i had a question says, a 600kg car, traveling 30ms-1, and comes to rest in 10s after braking. What is the average braking force? How would i go about calculating it? Any...

Please help! This is urgent! Homework Statement 1) A typical car's brakes can create a maximum acceleration of less than 5 m/s^2 . How close can you get to a stop sign before you start braking? Homework Equations no idea at all since there isn't even enough information given to solve...

1. The coefficient of static friction between the tires of a car and a dry road is .62. The mass of the car is 1500 kg. What is the maximum braking force is obtainable: a. horizontal to the road. b. on an 8.6 degree downgrade? 2. F=mA f(s)=M(s)N N=mg F=f(s)-mgsin(x) 3. a...

I am planning to build a bicycle with mechanical regenerative braking. I am thinking of setting a spiral spring to wind during braking and use its tension to assist in climbing hills Would such a spring give me enough power for this? Are there any other alternatives? Is this feasible?? Any...

I am starting to program a simple physics model of a car to help me understand how it works. I am certainly going to have to make quite a few simplifications as I'm only just about to start A levels. Whilst researching how to simulate engine braking I came across the Racer (racing simulator)...

Hey guys could some one give me a link to an engineering report on maglev trains. I am doing an assessment on braking systems and have chosen magnetic brakes from the maglev train. So i need a full on complex engineering report on them and info on Hydro-Aire Brakes, Aerodynamic Brakes, Linear...

Hi All, I know this type of question has been asked many times but I need help to clarify for myself if I'm doing the right thing. So here goes... I am trying to simulate/understand the forces on a vehicle as it is traveling on a road. In particular as it is traveling up hills. So if I...

If the speed of a car is increased by 75%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time I'm not sure how to start this problem. I am not sure what to do without any numbers to use in a formula. I do not know...

Homework Statement A car with an initial speed of 20 m/s brakes to a complete stop after traveling distance b from the moment the brakes are applied. What would be the minimum braking distance if the initial speed was 60 m/s? Homework Equations W= ΔKE The Attempt at a Solution I...

When a rectangular loop of wire is drawn into a uniform magnetic field, there will be an induced current. What I don't understand is whether there are two components to the motion of the electrons, one of the current relative to the wire, and one of the whole wire relative to the field. If we...

Has anyone heard of this company? I'm told they build retro-fit magnetic braking systems for roller-coasters etc. but all I have is the name and I can't find a website. Any help is much appreciated.

I have to try and design said system for a university project where we're designing a roller coaster. Basically its going to be a copper fin that will move between two magnets but I have no idea how to calculate the mass of copper and strength of magnet I'll need to decelerate the car...

I've been trying to figure this one out for two days now. No Dice. If you feel like working the whole thing out, by all means, cause everyone who tried to help me so far was wrong. Homework Statement You testify as an "expert witness" in a case involving an accident in which car A slid...

I'm aware that some fast aircraft possesses drag 'chutes to slow them down on landing. I was pondering a few things about these... At what maximum airspeed can aircraft that possesses them, deploy them? Would it be useful to aircraft to be able to deploy braking 'chutes earlier and thus at...

Let's say you have a body in motion, a car, an airplane or hovercraft - does not matter, looking for basic laws of physics here. 1. You know the weight. 2. You know the center of gravity at rest. 3. You know the center of lift (if applicable). Let's say our object weighs in at 600...

A car is traveling at 7 m/s when the wheels are locked up. The car slides 1.5 meters before coming to rest. If the car had been moving at 14 m/s, how far would the car slide, assuming the same breaking force is used? Not sure where to go with this problem...

OK, I have some homework, due soon, and could use some help. If you can give me an answer and show me how you got it, great, but I'm here to learn too. A car with a mass of 1300kg is initially moving at a speed of 40 km/h when the brakes are applied and the car is brought to a stop in 15 m...

Just a quick question everyone. It's annoying me quite a lot as I used to know it, but I've not done physics for over a year and I'm getting quite rusty. My question concerns a car under braking, and how the its velocity is reduced. As I understand it, the frictional forces generated by the...

Hi I am new to the forums and i'll try and keep this short and sweet. A couple weeks ago i started going to driving school, its boring but neccessary. On the first day she said (the teacher) that a fully loaded transport truck will take LESS time to stop than an empty one. her reasoning for...

I am currently doing an electromagnetic braking experiment for a course at school. While I have got some results, I am unsure: a) whether they are accurate to what should be expected. b) where I am going to go with the results- is there any formulae manipulation anyone can suggest so that...

I am having problems with starting a certain problem. A train traveling at 297 km/h requires 1.45 km to come to an emergency stop. Find the braking acceleration, assuming constant acceleration. Now I am not given the acceration or time so this one is stumping me. I have tried several...

The coefficient of static friction between the tires of a car and a horizontal road is s=0.56. If the net force on the car is the force of static friction exerted by the road, what is the magnitude of the maximum acceleration of the car when it is braked? I really don't understand what is...

Does anybody know the empirical formula that relates the initial velocity of a car in a street with the length of the mark on ground left by the tires when the brakes are set at maximum force, stopping the wheel ?

Many traffic warnings issues tell it's much better to brake without pressing the clutch pedal. For instance, we drive a car at 120 km/h and suddenly we have to brake in the shortest distance as possible due to some obstacle on the road. What is better? 1) Should we press the clutch pedal at the...

Im new here and I really don't know the standard sorry if this is too easy for you, There is a car moving at constant speed and suddenly the driver applies the brakes. So everyone in the car moves forward. But as the car holts the people go forward. Why? With reasons. I have a decent solution...

I have recently completed my mid-year chemistry exam and came across a question that i cannot find an answer to. Me and my friends completely disagree and i was wondering if anyone could help me? -The question showed a simplified diagram of a train around a circular section of a track, and the...

I've begun an experiment as part of my final year at college, concerned with electromagnetic braking. The experiment uses a fixed magnet to decelerate an aluminium plate moving at speed dictated by a falling mass and pulley system. Since i have not studied electromagnetic induction or braking...

A car traveling at a speed of vo = 59 m/s stops smoothly (that is, its deceleration is constant) over a distance of d = 166 m. There are 3 parts to this quetions. 1. what is its acceleration during the time it is stopping 2. how long does it take for the car to stop 3. after the car has...

Ok i have this problem and i have having trouble with it. It reads: A car starts from rest and travels for 5.0 seconds with a uniform acceleration of +1.5m/s^2. the driver then applies the brakes, causing a uniform acceleration of -2.0m/s^2. If the brakes are applied for 3.0 seconds find...

I haven't taken physics in my college curriculum yet, so could someone help me understand why when slamming the brakes on my car, the weight of my car isn't a factor in the "slide to stop" time? Assuming I am not pulling weight behind me (trailor or something) and I have no collision with...

The problem is simple, its a matter of finding a car's initial velocity after locking up the wheels while braking. Here is what I know: The braking distance (skid marks) go for 20 feet, the final velocity is 50m/s, the mass of the vehicle is 2000kg, and the coefficient of friction of the...

Hi, I'm doing a school project regarding electromagnetic braking I just wondered if anyone could point me in the direction of some good websites which could help me?