What is Braking: Definition and 198 Discussions

Hello, I don't know if this is the right place to ask this, but here it is: Does the brake pad/rotor temp effect the stopping distance at an emergency brake scenario on a motorcycle ? Assumptions; 1) there is enough of traction between the tire and the asphalt 2) a performance...

kinematics question -- An automobile accelerating and braking Homework Statement According to recent test data, an automobile travels 0.250 mi in 19.9 s, starting from rest. The same car, when braking from 60.0 mi/h on dry pavement, stops in 146 ft. Assume constant acceleration in each part...

It is known that a charged particle moving with some acceleration emits electromagnetic waves. For example, this may be a particle moving at a constant speed on the circle. In this case the radiation of a particle is called the braking radiation, the cyclotron radiation, or the synchrotron...

Hi to all, I'm new to the forum. I'm designing a bracket for a front caliper of a motorcycle. I'm learning to use solidworks just to design a bracket that will be safe to use in the real world :-).. but I'm stuck on calculating the force that will be generated on the bracket (or better...

I have been doing some working on braking energies, and have hit a bit of confusion with regards to the kinetic energy of the wheels and tyres. Obviously, the kinetic energy of the moving car itself follows the old rule of 1/2mv2. For a 1000kg car at 30ms that's then 450kJ. I have then...

With the brakes fully applied , a 1470 kg automobile decelerates at the rate of 7.5 m/s^2. a) what is the magnitude of the breaking force acting on the automobile? 1470 *7.5=11025N ( I think this is correct) b)if the initial speed is 90km/h (25 m/s) what is the stopping distance? im...

Everybody, I am designing a braking system for a direct drive (no gear box) wind turbine. I am not sure how to calculate the braking time and number of brakes required. I made this in two methods, which gave different values. What is the exact method for calculating the number of brakes and...

I'm setting up an experiment and I 'd like to somehow quantify the effects of magnetic braking on a simple pendulum. At the moment, I have a curved sheet of Aluminium that I will swing freely between two magnets set up in yoke (horseshoe magnets). The magnets induce eddy currents in the...

Homework Statement A car weighing 1500kg traveling at 20m/s brakes, and takes 50m to stop. Part A) Calculate the work done Part B) Calculate the power needed to stop the car Known starting variables are.. u=20 v=0 s=50 m=1500 Homework Equations P=Fv W=Fs F=ma s=1/2(u+v)t...

Homework Statement Consider the eddy-current braking. A square loop, with 10 cm side is shot with the velocity 10 m/s into the uniform magnetic field with magnitude 0.1 T. The field is perpendicular to the plane of the loop, and the loop starts entering magnetic field at t=0. The resistance of...

Homework Statement A trolley weighing 16 000kg is moving along a horizontal surface with a velocity od 6m/s. What braking force would cause it to brake on a distance of 10m and how long it would take? Homework Equations a = F/m = ΔV/t The Attempt at a Solution So ΔV = 6m/s, m=16...

Hello , I have to change a car's rear drums to discs . I have the weight at each of the rear wheels . Using DAC I know the max speed and max Decelerations sustained by the car . What are the basic formulae used to calculate the braking forces and the braking distance .

Homework Statement When you slam on the brakes your car decelerates but this is not constant as it starts at a higher value and then reduces. This has something to do with the coefficient of friction between the brakes and the discs, but what is it and what are the reasons for this...

Hey everyone, I've been a long time lurker on this forum and finally just made an account. My final year project is in the design of a regenerative braking system for a EV. I'm reading a Modern electric vehicle design Book and came across an equation that I don't quite understand. This...

Homework Statement the driver of a 1500 kg car traveling at 12.5 m/s slams on the brakes, locking the wheels, and bringing the car to a stop. If the coefficient of friction is .735, what is the braking distance of the car? Homework Equations W = K_f - K_i friction force The Attempt...

Homework Statement a small truck of mass 2.00*10^3 kg traveling at 72.0km/h experiences a force of 1.00*10^4 N for 0.800 s, when the brakes are applied. What is the final velocity? Homework Equations The Attempt at a Solution

Homework Statement In the figure below, the driver of a car on a horizontal road makes an emergency stop by applying the brakes so that all four wheels lock and skid along the road. The coefficient of kinetic friction between tires and road is 0.36. The separation between the front and rear...

I have a report to write on "recovery of braking energy to enhance the performance of I.C. Engine". i can calculate the energy lost during braking but i don't understand how that energy is restored in batteries and how much energy can be stored and etc. Can anyone explain fundamental working...

Homework Statement I just took the test, but I can't remember the question word for word, it was along these lines though: You are standing on bus. It suddenly brakes what is the force that makes you lean forward? A: Kinetic friction of your shoes on the bus floor B: Static friction of your...

Hello, I would like to know what will be the shape of the torque-speed diagram in braking quadrant. Many thanks

Hello I am having some trouble solving a problem related to braking forces. The assignment is this: A birdwatcher sees an egg falling from a 20 m tall tree. (Though the 20 m might not have anything to do with this particular task because it is part of a longer question). The egg strikes the...

I'm calculating the weight transfer experienced by a car during braking, accelerating and cornering. So far i have been using moment equations with the centre of gravity height. I've used some suspension software to determine the roll centre and was wondering if this is meant to be used when...

the weight of a car is 700 kg the weight put on the brake pedal is around 30 kg to stop the vehicle moving with a speed of 50km/hr. please help me out.

Homework Statement An automobile is traveling at 16 m/s. The driver perceives a need to stop and applies the brakes producing a (negative) acceleration of 4.0 m/S2. Take the reaction time of the driver, the time to move from the go pedal to the stop pedal, as 1,0 s. Homework Equations...

Homework Statement The car velocity is 100 km/h. Suddenly, the driver sees a elk 120 m from the car standing on the road. The driver’s reaction time is 1,5 s, after which time the driver starts braking. The braking is assumed steady and the deceleration is 7,5 m/s2. The car stops in 4 s...

Homework Statement Motorcyclist (total mass 320 kg) stops from a velocity of 36km/h in 25 s without breaking. The same motorcyclist accelerates in the same conditions from full stop to velocity of 126km/h in 6 s. Homework Equations Calculate the constant forward carrying force of the...

Homework Statement A separately excited DC motor with 220V, 970rpm, 100A and Ra=0.05ohms. It is braked by plugging from an initial speed of 1000rpm. I need to calculate i)the resistance to be placed in the armature circuit to limit braking current to twice the full load value, ii)the...

Homework Statement Assume that the driver of a car begins to brake his car when the distance from his car to a wall is 107 m. The mass of his car is 1400 kg, and its initial speed prior to braking is 35 m/s. The coefficient of static friction is 0.50, and assume that the car's weight is...

Hi, I was wondering about the idea of having torsion springs as a means to store kinetic energy when braking in a bike. I've thought about using compressed air but I am having troubles designing a gear system for both so that you can get the energy back to accelerate from rest. Can anyone...

Hey, how do you calculate the driven load inertia that you need to calculate the total system inertia. I know the motor rotor inertia is 2.872 lb/ft^2 and the Gear Ratio is 52:1 but I can't seem to figure out how to get the driven load inertia for the equation: WK2s = WK2m + (WK2L / GR2)...

Homework Statement A 900kg car is moving up a 15degree inclined slope at 40ms-1. The driver slams on the brakes, skidding to a halt 40m along the road. Calculate the total work done by the car. Homework Equations This is what I am not sure of. As I am not told whether or not the...

Homework Statement A crate sits unrestrained on the back of a flatbed truck traveling along a straight road at a speed of 80km/hr. The driver applies a constant braking force and comes to a stop in a distance of 22m. What is the minimum coefficient of static friction between the crate and the...

I don't require an answer to the problem itself, but rather a method I can use to solve it: Homework Statement You spot a deer down the road, so you brake to stop before hitting the deer. If your initial speed was 23m/s, what was your average velocity during braking? Deceleration was...

Homework Statement A car with a speed of 40.0 km/h approaches the bottom of an icy hill. The hill has an angle of inclination of 10.5 degrees. The driver applies the brakes, which makes the car skid up the hill. If the coefficient of kinetic friction between the ice and the tires if 0.153...

Homework Statement Estimate (i) the mass of the brakes of a train needed to stop the brake block temperature reaching melting point when the brakes are applied (ii) the number of photons emitted per second by a light bulb An order of magnitude estimate is sufficient. Homework...

Hi there I'm building a zipline and want to create a simple braking system that will progressively slow a 250lb person (me) from a top speed of about 30mph to zero in about 10' The braking system is as shown in the attachment. I'm a long time out of college, so although I recall the...

Homework Statement The front brake pads on your car wear out faster than the rear brake pads; in fact, some cars are specifically designed with large front brake pads because of this. This results from the fact that when a car is braking the magnitude of the friction force acting on the...

Hi guys, I am new to this forum, but I am in desperate need of help on something for my Final year university project. I have designed a Trolley and need to calculate some forces. Does anyone know the formula to calculate the pushing forces required to stop this trolley from moving. Weight...

For a college assignment I am designing a centrifugal braking system which will limit the rotational speed of a merry-go-round to a pre determined value. I am using a system similar to the picture shown below. The brake will be using on the central shaft of the merry-go-round and a drum will be...

Homework Statement A sportscar, Fiasco I, can accelerate uniformly to 68 m/s in 30 s. Its maximum braking rate cannot exceed 0.75g. What is the minimum time required to go 1300 m, assuming the car begins and ends at rest? (Hint: A graph of velocity vs. time can be helpful.) Homework Equations...

Homework Statement I have been using a dc motor, spinning it up to a given speed, not really important. Have used rotational inertia or a disc to work out rotational kinetic energy. After this i have braked the disc by using a load resistor circuit (LR), from which i measured the voltage...

I have a Chevorlet Lumina 2001. It has got Disc brakes in front as well as in rear wheels and its automatic transmission. Recently I had replaced the Brakes shoes and had to resurface the Discs by Grinding ,for the front wheels. The real problem is the cars start vibrating every time I...

Homework Statement a light shaft carries a steel disk 400m dia, 50mm thick,density 7800kg/m_3 calculate : (a) if the frictional resistance is equivalent to a torque of 1.5Nm, determine the braking torque to bring the disk to rest from 43.98 rad/s in 4 secs. (b) what would be the time...

Hello, I'am new to this forum and this is actually my first post. And I have some questions about regaining braking energy. We are thinking of using an electric motor to speed up and slow down a new and innovative train. The idea is to regain energy while the train is slowing down with the...

please explain engine braking? the definition i found was " braking effect caused by throttle position induced vacuum in petrol engines".In what way is this better than external braking?

Homework Statement A car is traveling at 120km/h when it slams on the brakes. How long is the skid mark if the coefficient of friction is 0.62?(hint: convert km/h to m/s) Given: initial velocity: 33.3m/s; final velocity: 0m/s; coefficient of fricition: 0.62 Homework Equations μ =...

1. You are driving toward a traffic signal when it turns yellow. Your speed is the legal speed limit of v0=55 km/h.: your best deceleration rate has the magnitude a = 5.18 m/s^2. Your best reaction time to begin braking is T = .75S. To avoid having the front of your car enter the...

A car was involved in an accident. There are skid marks of 40m and the car has a constant deceleration of 7m/(8^2) when braking. How fast was the car traveling when it started braking? (Not actual question I'm trying to solve, but very similar) Hint: f(x)= location f′(x) = speed f′′(x) =...

Calculating "Additional" Braking Torque Due To Momentum Hi, First off this is not a homework problem :-) I'm trying to understand how one could calculate the "additional" torque that vehicle brakes have to apply due to it's momentum? I have been told that when you consider the vehicle...

Can anybody shed some light on anti-lock braking systems? I currently have a model that calculates a vehicle stopping using kinetic sliding friction i.e. it skids to a stop with coefficient of friction at around 0.7 asphalt/tyre or tire which ever you prefer ABS I believe maintains static...