What is Cars: Definition and 434 Discussions

A car (or automobile) is a wheeled motor vehicle used for transportation. Most definitions of cars say that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people rather than goods.Cars came into global use during the 20th century, and developed economies depend on them. The year 1886 is regarded as the birth year of the modern car when German inventor Karl Benz patented his Benz Patent-Motorwagen. Cars became widely available in the early 20th century. One of the first cars accessible to the masses was the 1908 Model T, an American car manufactured by the Ford Motor Company. Cars were rapidly adopted in the US, where they replaced animal-drawn carriages and carts, but took much longer to be accepted in Western Europe and other parts of the world.Cars have controls for driving, parking, passenger comfort, and a variety of lights. Over the decades, additional features and controls have been added to vehicles, making them progressively more complex, but also more reliable and easier to operate. These include rear-reversing cameras, air conditioning, navigation systems, and in-car entertainment. Most cars in use in the early 2020s are propelled by an internal combustion engine, fueled by the combustion of fossil fuels. Electric cars, which were invented early in the history of the car, became commercially available in the 2000s and are predicted to cost less to buy than gasoline cars before 2025. The transition from fossil fuels to electric cars features prominently in most climate change mitigation scenarios, such as Project Drawdown's 100 actionable solutions for climate change.There are costs and benefits to car use. The costs to the individual include acquiring the vehicle, interest payments (if the car is financed), repairs and maintenance, fuel, depreciation, driving time, parking fees, taxes, and insurance. The costs to society include maintaining roads, land use, road congestion, air pollution, public health, healthcare, and disposing of the vehicle at the end of its life. Traffic collisions are the largest cause of injury-related deaths worldwide.Personal benefits include on-demand transportation, mobility, independence, and convenience. Societal benefits include economic benefits, such as job and wealth creation from the automotive industry, transportation provision, societal well-being from leisure and travel opportunities, and revenue generation from taxes. People's ability to move flexibly from place to place has far-reaching implications for the nature of societies. There are around 1 billion cars in use worldwide. Car usage is increasing rapidly, especially in China, India and other newly industrialized countries.

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  1. C

    Two cars, acceleration, and speed.

    At the instant a traffic light turns green, a car starts moving with a constant acceleration a of 3.07 m/s2. At the same instant a truck, traveling with a constant speed of 9.72 m/s, overtakes and passes the car. How far beyond the traffic light will the car overtake the truck? I've been...
  2. E

    What is the velocity of car 2 when car 1 is going 1/2 the speed of light?

    car 2 is twice as long as car 1 when they are at rest a stationary policeman observes that car 2 is the same length as car 1 as car 2 passes car 1 going through a speed trap. car 1 is going 1/2 the speed of light I tried to solve this with L 1/sqrt(1-(1/2)^2) = 2L/sqrt(1-v^2/c^2) and...
  3. I

    Cell phones and unlocking cars

    Has anybody heard of this myth/urban lengend? Any thoughts on how feasible it is? This only applies to cars that can be unlocked by that remote button on your key ring. Should you lock your keys in the car and the spare keys are home, and you don't have "OnStar," here's your answer to the...
  4. S

    Conservation of momentum of two cars

    For my physics assignment i have a question on conservation of momentum that i am completely unsure of and have heard mixed answers to from teachers and fellow students. Here is the question and can ai have nice detailed answers please. Thanks in advance. Section A - conservation of momentum...
  5. wolram

    Unlocking the Mystery of Turbulent Flow for F1 Cars

    One of the factors that can produce a winning F1 car is the understanding of turbulent flow, the people that design these cars spend millions on wind tunnels, simply because turbulent flow has not yielded to mathematics, my way of thinking is ,that it is essential to understand turbulent flow...
  6. H

    Minimum Speed for Stunt Driver to Safely Jump Over Cars

    Homework Statement A stunt driver sets a jump off a horizontal platform and over ten cars. The height of the platform is 1.25 m, and the total distance of the cars is 20.0 m. Find the minimum speed required to safely clear the cars. Homework Equations x - x initial = velocity X t + 1/2...
  7. C

    Physics lab colliding two cars into each other

    hello, The other day in class i completed a lab colliding two cars into each other 3 times. The first time velcro was attached to the cars so they stuck together after the collision, the second time a spring was attached to one of the cars and the third time it was just the plain bumpers...
  8. ShawnD

    Cars: Stability Control Benefits - See What Happens on Sheet Ice

    As much as I hate starting a thread about a youtube video, I think this one is important I had no idea stability control was that good; this guy was able to drive on sheet ice. My car does not have stability control or even a limited slip differential, so my left turns in winter are a lot...
  9. R

    Grounding Cars: Why a Rubber Strip is Needed

    In my physics book it says that friction between cars and air can cause a build up of charge on the vehicle's body and that's why a rubber strip is often connected from the body of the car to the ground - to ground the car. Since the tyres which are rubber are connected to metal which is...
  10. V

    Winding "Hot" Armatures for HO Slot Cars

    I play around with HO slot cars and would like to wind my own "hot" armatures but I can't find any sources of direction. It seems like everyone knows how to do it so why explain:frown: I've bought a couple of pounds of mag wire in different guages but I would hate to tear up a good one to...
  11. D

    Calculating Speed & Kinetic Energy of Two Cars Colliding

    A 2000kg car traveling to the right at 30 m/s is chasing a second car of the same mass that is traveling to the right at 10 m/s 1) if the two cars collide and stick together, what is their speed after the collision? 2) What fraction of the initial kinetic energy of the cars is lost during this...
  12. B

    Two-Wheelers vs Cars: Tire Anatomy Explained

    Is it true that there are metal wires in the tires of two wheelers where as car tires come with metal plates inside them?
  13. G

    Newbie Seeking Answers on Physics of R/C Cars

    Hi there, this is my first time opening a thread here, i have heard a lot about this site, and how usefull the people are on this site, so please help me out. Okie, For my summative in Physics, i need to talk about physics about R/C car, so right now, i have a few questions, please bare with...
  14. F

    Any creative ideas for a high school physics car project?

    Hey, there. I'm in high school physics, so hopefully this problem will alow you guys to think creatively without hurting your braincells. We're supposed to build a car out of index cards/file folders, tape, glue, straws, paperclips and rubberbands only. The car must go at least 20 ft and...
  15. S

    Convert Your Car to Run on Water: Plans, Drawings, and Reviews"

    hello every one while surfing i came across this site http://netmar.com/~maat/archive/feb2/carplans.htm it has some plans and drawings for adapting an ordinary petrol/gasoline engine to run on water i just started university as a mechanical engineer may be i will take this as a final...
  16. H

    Inelastic collision at an angle with two cars

    almost there-inelastic collision at an angle Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at speed 2v, while the second was traveling at speed v at an angle phi south of east. After the collision, the two-car system travels at...
  17. S

    What Is the Center of Mass of a System of Moving Cars?

    Please check my answers. A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Another car, with mass 1800 kg and speed 20.0 m/s, has its center of mass 40.0 m ahead of the center of mass of the station wagon. a)Find the position of the center of mass of the system...
  18. I

    Two cars approaching an intersection

    Hi, I have this problem that I can't seem to figure out. I'm taking physics in French but I will try my best to translate it. At an instant, two cars, A and B, are 10km away from an intersection of two perpendicular roads. Car A is moving towards the East and has a speed of 30km/h whereas...
  19. C

    What is the cars acceleration, assuming forward is positive?

    today is my first day here so if i violate any rule that apply in this forum please forgive me.. the question is Dr. Silverstein is driving a 1.95 * 10^3 kg car at 55.0Km/hr. He slams on the brakes and comes to rest in a distance of 17.0 m Assume that Dr. Silverstein has a mass of 75.0 kg...
  20. M

    Calculating Time for Two Cars to Meet in Alaska

    Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 105 km/h north and the VW is traveling at 43 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11 km. Approximately how long will...
  21. C

    Solving Two Cars Intersection Problem: Velocity of Car B Relative to Car A

    These two problems are giving me some guff. Any ideas on how to solve? Two cars approach an intersection of perpendicular streets. Car A is moving north at 10.5 meters per second, and Car B is moving west at 17.1 meters per second. What is the velocity of Car B relative to Car A? (In other...
  22. S

    Kinetic Energy & Cars: 4x the Energy at 100km/hr?

    I don't understand how kinetic energy works: How much kinetic energy does a car have when it moves at 100 km/hr, as compared with when it moves at 50 km/hr? The answer is 4 times as much, but why?
  23. S

    Chasing Cars Problem: Find GC Speed to Catch BC

    A blue car pulls away from a red stop-light just after it has turned green w/ a constant acceleration of .6 m/(s^2). A green car arrives at the position of the stop-light 4.5s after the light had turned green. What is the slowest constant speed which the green car can maintain and still...
  24. M

    What Happens When a Projectile Is Fired Opposite to a Moving Car?

    [link looks fishy - deleted by moderator] ok so one of my friends asked this question.. if you are riding in the back of a truck, and the truck is traveling at the speed of a projectile, what happens when the projectile is fired the opposite direction that you are traveling? (see...
  25. Cyrus

    I hate all American cars because there ugly

    I love the corvette. Normally, I hate all American cars because there ugly, they drive like crap, and they break down all the time. But I went to the rev-it-up event at Fed-Ex field today where you could drive any chevy around a track. So I spent the entire day tearing it up in a black and...
  26. Ivan Seeking

    News Uncovering the Truth Behind Event Data Recorders in Cars

    http://money.cnn.com/2006/08/22/autos/edr_concerns/index.htm More of the same... On the face of things it seems like a good idea, but as this technology evolves and becomes accepted, I expect this to lead to much more invasive devices and tactics. Already we find that our driving was being...
  27. M

    What Is the Future of Cars and Petrol?

    hey.,.. I am just wondering wat the future is for cars and petrol? are we gona have electric cars or waterfueled cars? wats happening next? how long til petrol runs out?
  28. A

    Cars in mechanical and aerospace

    I was wondering if anyone knows anything on this topic... I know that Mechanical Engineers are found designing cars in the automobile industry, but does anyone know if aerospace engineers (with a degree in aerospace engineering as opposed to mechanical engineering) are qualified (and if they...
  29. Q

    Toyota Yaris: Ultra-Compact Car for Scientists

    So I'm looking into buying a brand new, ultra-compact car. Currently, I'm fixated on the Toyota Yaris, which starts at about $11k. Gets about 33/40 city/highway. I was wondering if there are any other fellow scientists out there driving one of these gas efficient, yet tiny, cars.
  30. A

    Optimizing Sign Visibility: Investigating Angle Variations for Approaching Cars

    "The lower part of a 2.0 meters high road sign is at a distance of 4.0 meters from the car drivers eyes. It's difficult to read the sign at such a distance, as well as when the distance is too short. Investigate how the angle varies when the car is approaching on a straight road. At what...
  31. A

    How do physics affect the performance of cars in racing games?

    Hey, I'm trying to make a racing game that will run completely within a browser. It will be similar to BATracer, except that rather than using carsets - a model employed by games such as TOCA, NASCAR and V8 Supercars - I will follow the model employed by Gran Turismo, where you buy a car...
  32. Cyrus

    Tuners Club Car Show: Impressive Collection of Cars!

    My friend is part of the Tuners club at school. They held a car show today. I thought there was going to be some crapy cars there, people with big mufflers on their civics and such. I'm happy to report that I was wrong! It was really good, I take my hat off for them. They got a local infinity...
  33. S

    Problem on Suspension of Cars

    Hi The question is In practice the suspension system of cars consists of a spring under compression combined with a shock absorber.which damps the vertical oscillations of the car . Drwa sketch graphs one in each case to illustrate how the vertical height of the car above the road will...
  34. L

    Building a 40-Meter Mousetrap Car: Tips for Optimal String Attachment

    I have to build a mousetrap car that goes at least 40 meters. I know the design should be one big wheel in back, and two small wheels in front. Design aside, anybody have any advice on how to attach the string from the mousetrap to the axel optimally? Should I just wrap the string around...
  35. L

    Where can i get a good book on electric cars?

    Where can i get a good book on electric cars?? Does anyone knows a good book dedicated to electric cars? I mean, not a rigorous textbook nor a colourful brochure... Thanks guys
  36. G

    Can Cars Cause Electrical Interference with Streetlights?

    This is going back a ways, but we used to have a car (I think it was the '89 Camry) that seemed to affect our streetlights. The lights often seemed to go on or wink out as we passed under them. Was this one of those you-wouldn't-see-it-if-you-weren't-there things, where it only seems to be...
  37. T

    When will these cars pass eachother - kinematics

    Car A with u=0/s is on the northbound land of a highway and car B is traveling in th southbound lane at constant u=26.67m/s.At t=0 , A starts and accelerates at a constant rate a(A) . while at t=5 , B decelerates with constant magnitude of a(A)/6 . knowing that when the two carspass each other...
  38. T

    Cars A and B are d=60m apart and travelling at u(A)=8.8

    cars A and B are d=60m apart and traveling at u(A)=8.89 and u(B)=6.67.knowing that 45s after driver A apply his brake to avoid overtaking B,the two cars collide,determine the uniform deceleration of car A. i have tried to form eqns using s=ut + 1/2a(t^2) for both cars and substitute into [car...
  39. S

    Solving the Safety vs. Aerodynamic Efficiency Dilemma

    hey guys..totally confused on this question! How is the goal of safety at odds with aerodynamic efficiency? OK...the way I am interperting is as. How does the goal of safety interefere with the factor, or progress, of Aerodynamic Efficiency...any help on the answer and where to get started?
  40. I

    Flying cars from string theory ?

    Flying cars from string theory ? :) This is the link to the short story from http://motls.blogspot.com/2005/11/flying-cars-from-string-theory.html" . My comment: LOL ! But the kid seems to have potential...
  41. Y

    2 Cars Colliding with same mass

    Hiya. The problem I'm trying to solve is this: I have two cars, each with the same mass. Speed before Collision of Car1 = Xm/s Speed before Collision of Car2 = Ym/s To solve the problem of what speeds the two cars have after an ELASTIC collision, i used simultaneous equations. My...
  42. Y

    What is the outcome of a collision between two cars at constant speed?

    I feel so silly for not being able to work this out... The situation is this - two cars going towards each other. Both cars' mass = 1Kg. The speed of car 1, say, is 5m/s. The speed of car 2, say, is 3 m/s. THE IMPORTANT THING TO NOTE IS THAT BOTH CARS ARE TRAVELLING AT CONSTANT SPEED! What I'm...
  43. ShawnD

    Why do motorless cars prioritize light weight over heavier weight?

    If you've ever seen races where cars are just rolling down a hill with no engine, you would notice that they always emphasize how light their car is. Why? Isn't heavier better? Just follow me through my thinking here and see where the error is. assumption 1: all objects, without drag (look at...
  44. D

    Cars & Corrosion: 6 Testing Methods & Protection

    Here's some questions I need help with... Its about Cars & Corrosion 1. Name six ways that corrosion was tested on cars. 2. State two reasons that corrosion is not benificial. 3. How does ventilation stop corrosion? 4. In what way does mud contribute to corrosion? 5. What are the two...
  45. S

    Crushing Cars with Just a Mallet/Sledge Hammer

    Probably a dumb question: I've been curious after seeing some of these car bashing type events at universities and such, how is it possible to crush the steel frame of a car using only a mallet/sledge hammer? I thought the steel pillars on the roof of a car was supposed to be able to at least...
  46. Cyrus

    Static Friction on Cars: Does it Do Positive Work? Explanation and Examples

    I was reading a post in the homework section about friction being able to do positive work. Several people provided examples, and one was the case of a car. Doc Al pointed out that static friction did not do any work on the car because the wheel was not slipping and the friction force acted...
  47. A

    Overtaking Truck: How Far & How Fast for Car?

    At the instant the traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration of 3.55 . At the same instant a truck, traveling with a constant speed of 21.0 , overtakes and passes the car. How far beyond its starting point does the...
  48. T

    Hard word prob involving cars (HELP ME)

    Ok, here is the prob. You are arguing over a cell phone while trailing an unmarked police cruiser by 25m; both you and the cruiser are traveling at 110km/h. Your argument diverts your attention from the police cruiser for 2.0s (long enough to look at the phone and yell "I won't do that!"). At...
  49. B

    Will Salt help cool a cars radiator?

    Today while sitting parked in my FIL's van, the one I just put a new thermostat in, but failed to really test to see if it would overheat? A couple miles down the road, it pegs the temp guage. I put the OEM of 192* instead of 160* because it wasnt passing smog, they said the computer this/that...
  50. B

    Forces and Acceleration of Bumper Cars After Collision

    Katie, who is traveling southward in her bumper car, aims her car toward Sam, who is traveling northward in his bumper car. The cars collide and briefly come to a stop. What is the direction of the force exerted on Katie's car during the collision? What can you say about the...
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