What is Braking: Definition and 197 Discussions

Homework Statement car is braking evenly. The brakes are in locking essentially (not ABS brakes) Car is sliding under sliding friction. Car comes to a fullstop at the distance of 150m starting velocity was 100km/h (27,77m/s) calculate a) braking time b)cars deceleration c) friction coefficient...

Homework Statement On a train, there is a passenger who has an aquarium, filled with water. The aquarium's size: 40cm x 25cm x 25cm, and is filled with water up to the height of 20cm (5 cm remaining) What is the maximal deceleration of the train, such as the entire volume of water will remain...

Homework Statement A lifting system can be modeled as two blocks of mass m1 and m2 hanging from two pulleys, connected by ropes to a third block of mass M = 100 kg, lying on top of a horizontal surface. There is gravity g = 9.80 m/s2. a) Ignoring at first friction, find an expression for the...

Homework Statement The acceleration of a particular car during braking has magnitude bt, where t is the time in seconds from the instant the car begins braking, and b = 2.2 m/s3 .If the car has an initial speed of 60 m/s , how far does it travel before it stops?Homework Equations : [/B] I know...

A tractor and a Tesla drives in opposite directions. The tractor has a speed of 40.0km/h and the car has a speed of 80.0 km/h. The Tesla suddenly sees the tractor, and they both immediately start braking, both with constant accelerations of 5.00 m/s2 (opposite to their directions of motion)...

Homework Statement A car that weights 600kg, traveling at 300km/hr and the coefficient of static friction between the car and the road is 1.5, down force is equal to 2.6v^2 and air resistance is 1.5v^2 (v is in m/s). Calculate how many meters it would take for the car to stop with the breaks...

I have been doing a lot of reading online concerning this circuit but having little luck in my dilemma. I work in the bowling industry the machines use 1/3 HP 115 v single phase induction motors. FLA on these motors is 6 Amp. These motors use capacitors 480-520 MF for braking. This braking...

I have a controller fed 3 phase 1kw servomotor which moves a mass over 1 metre ramping up for 1 second whilst energised, then it ramps down for 1 second. The motor is on (energised) for 1 second then it is off (braking) for 1 second which completes the first cycle, the cycle is then repeated...

https://en.wikipedia.org/wiki/Braking_distance "Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop." I'd like to know something. When the brakes are fully applied and before the car stops. Are the...

Homework Statement Andrew is driving his van to deliver groceries in Elmvale. As he travels along Hwy 92, a fox stops on the road. Andrew is traveling at 75 km/h and is 42 m away from the fox when he applies his brakes. It takes him 3.4 s to stop. a) How far did Andrew travel before stopping...

Homework Statement A 1200kg car moving at 20 metres per second stops in a distance of 50m when the brakes are applied. a) What is the acceleration of the car when it is braking? b) Find the force applied by the car's braking system. Homework Equations For a) I used the acceleration formula...

Homework Statement Can someone explain what regenerative breaking is? Homework Equations no equations required The Attempt at a Solution I understand that this occurs with electric cars. It uses the idea that the electric motor and the electric generator are so similar. But how does the...

Homework Statement Driving along a steady speed of 26m/s and suddenly see a child 150m from you. Breaks can produce acceleration of -2.5m/s² but it takes time to get the foot from the gas to the brake pedal. How much time do you have, if to avoid hitting the child? Known: d=150m a=-2.5m/s²...

Hello Forum, Does anybody have suggestions as to how we can use IMU's (accelerometers and gyros) to determine the gradient of a road during a braking event. We have wheel speed inputs so can calculate decelerations independently from the IMU. Thank You Tim

Hello, I have a question about using the properties of conservation of angular momentum to provide mechanical resistance. Basically, I'd like to create a device that spins a disk similar to a gyroscope. The device has an external input that, depending on the configured orientation of the disk...

I'm a game programmer trying to write code to simulate a variety of cars braking at different speeds and on surfaces with different coefficients of friction. For now, consider that I'm interested in a fairly wide range of cars (people carriers, hatchbacks, saloons, sports cars etc) but that...

Hello, I'm trying to analyze the following system to get some idea about the forces present. The red line is supposed to represent the belt wrapped around the two drums. There is an extra part to the belt, however. Tangentially from the drum, a part of the string is attached to an unmovable...

Hello everyone,i am new here. I have a basic design problem that i am not confident about and require help. I have a disc with components on it and the disc is rotating with angular speed of 35 deg/sec(0.61 rad/sec).The moment of inertia of my disc+ component assembly is 185 kgm2. I have to...

Homework Statement A car comes to a stop in 7.5 meters while braking at a rate of 2.0m/s each second. A) What was the initial speed of the car? B) What is the speed of the car after 0.5 seconds? Homework Equations Final velocity = Initial velocity + acceleration*time The Attempt at a Solution...

Hello, In Vehicle Braking system manufacture suggest me to use SAE 20W-40/APIGL 4/ZFTF - ML05F oil for disk brake. But i want to use ISO VG 46. So is it feasible oil?

(a) Newton's I law : a body will move without stopping unless any force acts. (b) There is no air in space, hence no aerial friction. From (a) and (b), how can a rocket stop in space? How it applies brakes?

Hello guys, I have been trying to calculate the maximum torque that can be applied to my driveline through regenerative braking, using the equations from this paper: https://smartech.gatech.edu/bitstream/handle/1853/47660/sambamurthy_aravind_201305_mast.pdf?sequence=1 I have been using the...

Hi, I am looking for some help with a project I am doing where I am designing a braking system for a machine. The machine can travel up to a maximum speed of 12khm and weighs 5000kg. I need to stop the vehicle in approx. 6 meters/1.2m/s deceleration, using two drum brakes which are operated...

Two trucks with the same futures,one loaded and one empty. They are traveling on same speed and when they brake on the same spot;which one stops earlier? Does a truck's load affect it's braking distance? Thanks..

Hello everyone! I have a thesis about electromagnetic retarders. I need to do torque analysis for retarder; but I don't know how to do it on Maxwell 3D. I've tried Eddy Current solition; but analysis results didn't comply to electromagnetic retarder's torque charasteristic. Could anyone help me...

Assume a car has a smart regenerative braking system that optionally locks up the wheels with the tires skidding or allows the wheels to rotate while skidding, using the torque from the rotating and skidding tires to generate power into some type of kinetic energy recovery system. Assume the...

Hoping someone on here could help; I'm looking for a point in the right direction for a winch braking query. I have a mass moving horizontally, unspooling a free-wheeling winch as it moves. I'm looking to select a suitable pneumatic caliper disc brake to act as an emergency stop for this winch...

Many modern electric train locomotives have the option of regenerative braking. Most of these locos have HVAC power transmission. I'm wondering, when they brake in regenerative mode do they actually generate DC (I'm not sure whether modern electric locos prefer DC motors or AC motors or is the...

- You are driving car with 100 mile/hour - You are pressing brake pedal. - The speed of car is suddenly gone down. Decelerated. - However, Wheel is rolling on road without sliding and car stopped smoothly finally.In this case, - the tangent force acting on road surface is related with...

Hi all, I want to know the why the Braking force coefficient is increasing first and then decreasing with respect to wheel slip. I attached the graph for your reference

Hi,I am trying to design a simple autonomous braking system for a 4 wheel drive ATV. The system needs to be as cheap as possible. I have come up with two possible solutions. The use of a linear Actuator to activate the brake or a stepper motor attached in someway to the master cylinder. It needs...

I'm doing a university project which looks at regenerative braking in aircraft when coming down to land. Around 3MW of power is available when a large plane lands and we want to try and capture some of this by using generators on the wheels to charge supercapacitors, which will feed into...

Homework Statement For my ongoing project, I'm thinking of using Solar panels and Regenerative braking system as two main sources to charge the batteries that will run the motor and in turn the accessories of the car. Homework Equations I've to think of how can the above sources increase the...

Homework Statement A driver of a car suddenly sees the lights of a barrier 40m ahead. It takes the driver 0.75s before he applies the brakes, and the average acceleration during braking is -10.0m/s^2 What is the maximum speed at which the car could be moving and not hit the barrier 40.0m...

I always found this an interesting question How can you measure the braking distance of a car with a good reliability in normal conditions? From classical physics, we can assume that the braking distance can be found by determining the work needed to dissipate the vehicle kinetic energy...

Hi. I'm designing what effectively is a large door on hinges. The door has the following properties Mass = 336 kg Width = 1.8m The door rotates from closed position through 45deg to open position. In order to 'control' or damp the rotation of the door, I'm fitting a 3Nm friction clutch on...

This may not be the proper place to ask this so forgive me if wrong. Can someone direct me to the Federal Reg that "specifically" dictates that hydraulic braking systems MUST have 45 deg. "double" flare connections? I'm involved in a protracted forum thread regarding 45 deg double flare on...

I was taught that in conditions where there is less friction, such as on icy or wet roads, the braking distance of a car, is less than if the car was traveling in conditions with more friction, such as when the road is rocky or sandy. Although it makes sense intuitively, I recalled that...

I was taught that in conditions where there is less friction, such as on icy or wet roads, the braking distance of a car, is less than if the car was traveling in conditions with more friction, such as when the road is rocky or sandy. Although it makes sense intuitively, I recalled that...

The curve below is for a general electric motor drive(I'm guessing DC motor/possible 3phase induction). Would it be right to say that power generated in regenerative braking is the area under the curve in the 2nd quadrant ie the -ve M and +ve n(quadrant)? There are 2 portions of the diagram...

Traction-slip control: braking a low mu-wheel to "support" driving tor I've been doing some studying on traction-slip control(ASC). I've also been trying to draw comparisons between ASC with differential locking mechanisms on a μ-split situation. I don't quite understand how braking the μ-low...

Hi there, I'm currently researching for a Product Design project and was wondering if anyone had any insights into electronic braking systems. Are there any current systems being used on general automotive vehicles at moment? E.g The brake pedal represents the pressure of braking...

Suvat equations -- car braking hard to avoid a collision Homework Statement A car (A) is speeding along a rural road, of width 4m with a speed of 25m/s when the driver sees another vehicle (B) of length 3.5m just starting to cross the road at a point 40m ahead. The drivers reaction time is...

I am interested in the forces at play determining wheel lock up at different speeds. Lets say a car is capable of locking the front wheels up at 130mph. Does it lock up the wheels significantly easier at 30mph? If so, why? If we assume it can generate the same acceleration level from...

When all the 4 wheels are braking,it seems logical to write the longitudinal acceleration like this- $$m_{vehicle}.a_x = Sum of F_B $$ Where F_B are the brake forces at the 4 wheels. Now,what would the equation look like when ABS is working? Some of the wheels would be braking while...

Homework Statement The braking distance for an automobile with initial speed v is d. What is the braking distance if the initial speed of the automobile is 4v? Assume the automobile experiences the same constant acceleration in each case. Homework Equations v=v0 + at Δd = ∫v dt = v0t +...

A motorcyclist sees an obstacle and comes to a complete stop. Given are reaction time (0.8seconds), acceleration once started braking (-6.5meters/seconds^2), and total distance traveled (35meters) from initial sighting to complete stop. Solve to find initial velocity and time from when he...

I am working on virtual modeling, simulation & analysis of Heavy Trucks with Adams/truck. I need to check the Braking distance at Emergency Braking , I found some results from my simulation , Now I need the fundamentals of braking formula to know more about the theory , please help to find...

Homework Statement The driver of a car at 31 m/s sees (t = 0, x = 0) an obstacle down the road and brakes. The car slows down with a constant deceleration which has a magnitude of 6 m/s^2. Select the correct statement below (let d = stopping distance, all units are SI) a. The position...

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...