Car Definition and 999 Threads

When a car is moving the velocity of the connection point between the car and the ground is zero. So static friction must be act here ,mustn't it ? But my mentor said ,it is kinetic friction. Which is correct? If kinetic friction, why?

Hiya! I'm 43 years old, a total nerd, but I do like football (soccer). I program indie games (as "Properly Decent"). Currently I'm programming a car sim, so I figured it was useful to register on a forum to get help with some physics issues. I like the format of a forum, social media just...

I searched online but I couldn't find sources to support my investigation, the ones I found are either about formula cars or trucks. Links, sources and especially articles will be useful. thanks.

Hello! How do I find the final velocity of a car moving initially at 30.63 m/s after it has moved 45m. Over the 45 meters, It has only 1 opposing force, drag force. Ignore the force of static friction propelling it foward. However, this drag force is decreasing since this car is slowing down so...

In my approach, ##T - R = ma## ##4.5m - 4m = ma## and ##s = \dfrac{1}{2} at^2## ##a=0.5## therefore, ##30 = 0.5 ×0.5 ×t^2## ##t^2 = \sqrt {120} = 10.95## seconds ##≈11## seconds. Your insight is welcome or better approach...

For part (a) the answer key is saying it's 40 hp. I'm having trouble understanding this. So the car accelerates to 15 m/s, then it stays at that velocity of 15 m/s, needing only 20 hp power to overcome the work done by air resistance. Supposing the car then accelerates to 30 m/s and stays at...

Hi there, i just started to learn mechanic about few years ago and I wanted to know about car smoke color, What does the smoke color means in disel car and petrol car, Black,Blue,Grey,White smoke color?

I would like to propose a relativistic problem that I cannot understand. A car of rest length L travels at close to the speed of light towards a garage, of length L, which also has an opening at the bottom. For a person next to the garage door, the car has a length less than L, due to the...

TL;DR Summary: We were tasked to create a water powered car for a project for engineering design and the main specifications is as follows, it must hold 0.7L a min of water. For the first run it must move as far as possible with 0.5L of water and then on the second run it must be able to move...

On Saturday, I had to transport a used toilet brush in my car. Beforehand, I had washed the handle roughly, and ran the bristles under hot water. I am afraid that I had not washed it thoroughly enough. I had had to pack it into a small box, which I placed on the floor of the backseat of my car...

A car travels at low speed on a road from start to finish, and counts the number of turns of the wheel, which gives it a road length of N.2πR, where R is the radius of the wheel. Then he does the race again at relativistic speed. He sees the road with a Lorentz contraction. However, he has to...

Hi guys, i’m always looking to conserve at best my motorcycle and car, i’m here to understand the correct way to do it

I ask for help in interpreting this question. Thank you !

Hello all, I am sadly stuck on the last part of a circular motion question sheet I was given for homework. I have a mark-scheme with me, but it has actually given me more questions than answers. I have attached my working, and how I arrived at my answer, and the differences it has with the...

Here's an applied everyday life physics question based on a MVA (motor-vehicle accident) I was involved in a few weeks ago. I was driving straight when a women hit me from the driver side (said she didn't see me due to being in her blind spot - her claim, not mine, as I don't know if I was or...

Hey guys! So, I’m working on an engine coolant for track motor sports that can’t contain any glycols. I think a simple “water wetter” will work. A surfactant such as Tydol X-100 come to mind along with an anti foaming agent and aluminum corrosion inhibitor. I know there are commercial...

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Sorry if this is a very simple question but i have been googling and looking around for a straight anwser but can seem to find a solid answere or draw a solid conclusion from information I've reached. So I have a rgb led light for a car, the box says input 12vDC. if I wanted to set these up...

I'm working on a school project and I have to find and/or make a circuit schematic to a car anti-theft system that will disconnect the car battery shortly after the car alarm goes off. I am new to the electronic engineering field but I can differentiate a few different components on a schematic...

Good morning , I managed to simplify the physics of my car with only the centrifugal and traction forces. If I'm in control of it, the realism is acceptable for a city builder. On the other hand, I encounter a problem when the car follows an array of points. The path of the car on my graph...

My father has an idea is powering vehicle using negative pressure. I'm trying to explain to him that I don't think that can work. He is saying that imagine you're in space and you try create negative pressure by keep on removing and the only thing that's preventing the collapse of the material...

Hi, I was watching a documentary on car crashes and how designs are continually being optimised to keep passengers safe. They were saying how many ‘g’s’ certain crashes were based on crumple zones, seatbelt stretch etc. I was interested to do some number crunching to see how big the...

MENTOR Note: Post moved from General Discussion to Aerospace Engineering How did you find PF?: I found PF because of a late night idea I had when I was bored, but I have no idea how to do it so I was looking up information when I came across this app. I'm sure most of you guys on here know...

What is ideal rear roofline(rear window and trunk) angle and shape(straight line, curve ..etc) for lower drag? Keep in mind if you increase angle, you reduce butt area / wake, but induce low pressure at rear window/trunk , if you decrease angle you increase butt/wake but increase pressure at...

I drive car only at country roads allways at speeds 100-120km/h, no city and no idle time-heating engine etc. Why computer allways show very low average speed , 40-48km/h?I allways have feeling that this speed is too low because I allways drive way faster then this. Indeed all my friends have...

When car drive uphill, gravity/weight has drag component, that is reason why you must add more throttle compare to ligther car at same constant speed uphill. So logicaly car increase fuel consumption. But if you drive downhill, gravity/weight has thrust component, so your top speed("terminal...

A thread where we chat about car maintenance. What maintenance are you doing lately? What cost did you pay? What are things you've been recommended by your servicer that you're undecided on doing? Here is one for me: "engine system cleaning" ($200) The tech said it's recommended...

TL;DR Summary: Distance traveled by a car considering only air friction? How much distance would a 3-ton car travel if its initial speed was 17 km/h and we only take into account air's friction? (Assume that the car has an airfoil-like shape, so that the resistance against the air is very low)...

The general balance equation is as follow: d[m{u+gz+v2/2)sys=(u+gz+v2/2)dmin-(u+gz+v2/2)dmout +dq+dw. I understand that I would take in consideration the cross sectional area as well as the mass flow rate. However I can't figure out what else to consider as if atm pressure should be considered...

Is the doppler effect on electromagnetic waves receive by cell phone in fast car and so somebody talk with cell phone in fast car view this effect

Car has drag coeffecient of 0.35 and drink 5L/100km, if car Cd is reduced to 0.20 and everthying else stay the same(frontal area,power,weight etc),how much will car drink? Is it possible to calcualte this or we need something more? I am interested if exist direct link/formula between Cd and...

First I assumed the question asks about max e.m.f so I just used ratio: output voltage = (2500 / 1100) x 12.7 = 28.9 V, but the answer is wrong. Then I tried to use the ratio of the whole formula: $$\frac{\varepsilon_{1}}{\varepsilon_{2}}=\frac{NBA \omega_{1} \sin(\omega_{1}t)}{NBA \omega_{2}...

In a car we turn the wheels to steer. The wheels however are spinning about their axis of rotation when the car is in motion. Does the revolving motion of the wheels cause a force that opposes trying to rotate the wheels around the other axis to steer? How much opposition is created? Here's...

Hi! How does progress in semiconductor transistors such as Si to SiC or GaN, MOSFET to FinFET, 10nm to 2nm, etc. improves the performance of a controller such as the ABS, ESP, ESC, ... of a car? And how much is the impact of transistor technology progress on such a controller (compared to...

My sign doesn't check out and I don't get why that'd be the case. Forces that act --> ##F_{fr} and F_g## derivation: ##\Delta K = W_{NC} + W_C (1)## ##\Delta K + \Delta U = W_{NC}## ##\frac 12 mv_2^2 - \frac 12 mv_1^2 + mgy_2 - mgy_1 = W_{NC}## NOTE: ##y_2## assumed to be datum line so ##y_2 ==...

Panasonic is going to build an electric car battery factory plant in DeSoto, KS. Will hire 4000 jobs at the plant and another 4000 jobs throughout the state. IIRC, the factory will cost 4 billion dollars to build. edit: corrected spelling of DeSoto

How is it possible that friction makes car turn? From what I know, frictional force is acting along to the direction of the wheel turns. When the car turns, the direction of the frictional force now act opposite to the direction of the wheel turns! I'm sure if you rotate the steering wheel to...

i tried but i wasn't able, maybe i choose the wrong formulas in the wrong time.

When I was 18 years old, I worked at an automobile repair shop doing oil changes and other light mechanical work. The automobile repair shop hired me for this work to free up their real auto mechanics to do more advanced automobile repair work. One time I was assigned the task of replacing a...

Hi I am trying to do an artisanal EV car and I would like to know how do I choose the right motor. I already have one in mind but I don't know how to calculate the max mass that it can move. (see attached pdf) Gear Ratio : 2.39 Diff Ratio : 4.88 Wheel Diameter: 26in I would like to know the...

Suppose the car is moving to the right, so if the wheels roll without slipping, they are rolling clockwise. To get the wheel to slip, a counterclockwise torque would need to be applied to cause the wheel to have some angular acceleration. If the wheel was slipping, then the bottom of the wheel...

Static friction is known to provide centripetal force when a car turns. Assuming uniform circular motion, my questions are 1. Is the static friction of each wheel points toward the center of turning circle or it's the combined forces of all four wheels that has to point toward the center of...

Hi have to develop a mechanism which can wash car´s rims in a more effective way than car wash stations do, mainly by focusing on the geometry of the brushes and their motion... (circular motion is apparently not enough and that's why car´s rims don't get properly cleaned after a wash... Any...

How far will the car travel in $10$ seconds" \begin{align*}\displaystyle \Delta t&=10,\quad a=2,\quad d_i=0,,\quad v_i=0\\ d_f&=d_i+v_i\Delta t+\frac{1}{2} a \Delta t^2=0+0\cdot 10+\frac{1}{2} \cdot 2\cdot 10^2=100 \, m \end{align*} or $\displaystyle v=\int{...

I am trying to build a simulation of a car engine and wheels for a game project. My model is currently this: Engine outputs a torque -> this spins up a flywheel over time (the physics step of 1/60s) -> the flywheel is coupled with the clutch and thus transmission -> the transmission multiplies...

Hi everyone, I'm interested to know how much kilograms force an average car can produce. I made the following calculations to answer my question but I'm not sure if I'm right or wrong! Imagine we have a 1.8L engine that can produce a max torque of 155 nm @ 4250 RPM. 1st gear ratio = 3.455...

Is regular grade gas detrimental to a car’s engine?

hello guys can someone verify my solution (in the picture) whether the solution is correct or I guess the steps followed would be enough. There is no solution in the book for this one but wanted to be sure. Thanks in advance

If ##F## is constant, then mass is inversely proportional to ##dv/dt##. But ##dv## is constant too. So mass is proportional to ##dt##. More massive the body more time it will take to stop covering more distance. So car will cover less distance. Is my logic right ?