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. B

    Can Computational Flow Dynamics Predict the Performance of CO2 Rocket Cars?

    Hi All Hope this is the right forum, I am looking for an applied approach! I am interested in modelling the behaviour of CO2 powered rocket cars. These small models are powered by releasing pressurised carbon dioxide from a “sparklet” cylinder. The model cars race along 24 metre long...
  2. 1

    How much time has elapsed when the cars are 200m apart?

    Homework Statement Two cars are parked beside each other, facing in opposite directions. Car 1 accelerates at 5m/s^2 up to a max. speed of 25m/s, and Car 2 accelerates at 4m/s^2 up to a max. speed of 24m/s. How much time has elapsed when the cars are 200m apart? Homework Equations v=d/t...
  3. Borek

    Can Cars Really Run on Water? Debunking the Myth with Scientific Evidence

    Up to now I was absolutely sure it is impossible, but after seeing this video I have changed my mind. Yes, cars can run on water, and whoever says the opposite is a crackpot.
  4. N

    Forget electric cars, what about try to design photonic cars?

    Okay, I know that solar radiation from the sun is already a source of energy to be used as an alternative energy source for light, but solar energy is only one source of light. Scientists have already thought of applying photons as a source of current that would be used to carry out a myriad...
  5. K

    Elastic Collision of Two cars

    Hey there! So, I've got this sample exam that I'm working my way through, and I'm stuck on a few questions, but this one is particularly frustrating me: A careless driver rear-ends a car that is stopped at an intersection. Just before the collision, the driver slams on his brakes, locking the...
  6. M

    How Do Coefficients of Restitution Affect Collision Outcomes?

    Homework Statement The driver of a 3850 lb Pontiac traveling East at 32 miles/hr has a collision with a 3100 lb Toyota traveling East at 24 miles/hr. The coefficient of restitution is .27. Find: i) The final speed of the Pontiac after the collision ii) The final speed of the Toyota...
  7. R

    Everybody builds a cars or automobile as project

    Hi guys I am in a big problem. I have to make a final year project. Although am interested in automobiles(cars) and have real talent in deigning their exterior. But my friends say everybody builds a cars or automobile as project ... make something different. What should i make? I thought i...
  8. M

    Time when two cars have equal speeds

    Homework Statement At t = 0, one toy car is set rolling on a straight track with initial position 16.0 cm, initial velocity -3 cm/s, and constant acceleration 2.90 cm/s2. At the same moment, another toy car is set rolling on an adjacent track with initial position 10.5 cm, an initial...
  9. M

    Find the angle and the velocity of two cars after collision

    Homework Statement Two cars are driving on an icy parking lot, searching for a free parking space. The first car has a mass m1= 1000 kg and traveling at a speed of 20 km/h, the second car has a mass of m2= 800 kg and drives perpendicular to the direction of the first car at a speed of 15...
  10. L

    Blight of Subwoofers in Cars: Why Do People Do This?

    What a blight on society. Everybody hates them and the people who have them, except of course the people who have them. I have some neighbors who just moved in next door and the FIRST thing they do is turn the music on in their car. All you can hear is thumping and rattling of their trunks, so...
  11. V

    Collision of Two Cars: Calculating Velocity

    Homework Statement A 850 kg car is traveling west at 25.0 m/s when it collides with a 1050 kg car that was initially traveling north at 10.5 m/s. The cars lock together, and eventually skid to a stop. What is the velocity of the cars immediately after the collision? Homework Equations...
  12. A

    Work done by cables on railroad cars

    Homework Statement Two railroad cars, each of mass 1.6 104 kg, are connected by a cable to each other, and the car in front is connected by a cable to the engine as shown in the figure below. The cars start from rest and accelerate to a speed of 1.9 m/s after 1 min. (a) Find the work done...
  13. M

    Calculating Change in Distance of Two Cars Traveling in Opposite Directions

    Homework Statement Car A is traveling west at 60 km/hr. Car B is traveling north at 70 km/hr. The cars intersect at point O. When Car A is x km east of and Car B is y km south of O, the distance between the cars is z km. Find the rate of change of z when x = .8 km and y = .6 km. The...
  14. T

    Finding the rate of change of the distance between 2 cars

    Homework Statement Car A is traveling north on Highway 16 and car B is traveling west on Highway 83. Each car is approaching the intersection of these highways. At a certain moment, car A is 0.3 km from the intersection and traveling at 90km/h while car B is 0.4km from the intersection and...
  15. P

    Calculating Centripetal Acceleration & Force in Two Cars

    Two cars are traveling at the same speed of 28 m/s on a curve that has a radius of 124 m. Car A has a mass of 1080 kg, and car B has a mass of 1500 kg. Find (a) the magnitude of the centripetal acceleration and (b) the magnitude of the centripetal force for Car A, (c) the magnitude of the...
  16. B

    Drag Racing Cars: Physics Project Ideas

    i have just started with physics and i have a project where i have to make a scenario where two cars are drag racing in a quarter mile race and the one with the highest top speed loses. i don't even know where to start.
  17. S

    Mechanical Energy loss due to NC Forces: two railroad cars collide.

    [SOLVED-Thanks AL]Mechanical Energy loss due to NC Forces: two railroad cars collide. SOLVED! - Thanks Al! Homework Statement Two railroad cars each of mass 4800 kg and traveling @ 80 km/h collide head on and come to rest. How much thermal energy is produced in this collision? Homework...
  18. C

    Momentum collison of two cars.

    Homework Statement Two cars collide as shown. Car s1 is initially moving along the x-axis at speed v1 and car 2 is stationary. The final speed of car one is 10 m/s and goes 30 degrees north of x-axis. The mass of car 2 is 2000kg and goes 6 m/s at 44 degrees south of x-axis. What is the mass and...
  19. I

    2 cars drag racing question

    2 cars drag racing question... Homework Statement The first car has a constant velocity of 40 m/s and moves 10 m before the 2nd car starts moving. The second car speeds up with an acceleration of 3.6 m/s^2. What is the time and the displacesment before the 2 cars actually meet...
  20. M

    Collision of two identical cars moving in opposite dirrections

    What would cause more injuries to the passengers of each car? [no a pleasant example, I know] a) car colliding against brick wall. b) car colliding with an identical car moving in the opposite direction at the same speed. Does it have something to do with the amount of K.E liberated / lost?
  21. Loren Booda

    Following distance between cars

    "Following distance" between cars What is an effective rule-of-thumb for determining the following distance between cars? It might incorporate reaction time; relation between velocity, energy and friction; brake/tire/road conditions; and behavior of other driver.
  22. 1

    How long does it take the cars to meet?

    Homework Statement Two cars are at rest, facing each other, and 300 metres apart. If car 1 accelerates at 6.00m/s^2 up to a maximum speed of 30.0m/s and car 2 accelerates at 5.00m/s^2 up to a maximum speed of 35.0m/s, how long does it take the cars to meet? Homework Equations vf= vi +...
  23. P

    Uniform Circular Motion Hills and Cars

    1a. Homework Statement You are riding in a car over a hill that has a radius of curvature R. What speed should you be going if you want to feel one-third of your normal weight. Express your answer in terms of the radius R and the acceleration due to gravity g. 1b. You continue your...
  24. C

    Two E. Bound RR Cars Collide: What Happens Next?

    A railroad car that weighs 20,000 lbs. is traveling eastward with a velocity whose magnitude is 5 ft./sec. A second car, on the same track, that weighs 40,000 lbs. is also traveling in an easterly direction with a velocity of 7.81 ft./sec. When the cars collided, they became coupled together...
  25. U

    Relative Motion of two cars are moving with constant velocities

    Before I start studying the relativity theories, I have to grasp this concept: Suppose two cars are moving with constant velocities in any direction and a ball is thrown straight up and comes back straight down. This will happen in both cars. But what if a person in one car observes the...
  26. C

    Finding Force and Steep Grade for a Train with Given Acceleration and Drag Force

    Homework Statement A locomotive accelerates a 25-car train along a level track. Each car has a mass of 6.8e104 kg and is suject to a drag force f = 250v, where v is the speed in m/s and the force f is in N. At the instant when the speed of the train is 44 km/h, the acceleration is 0.20 m/s2...
  27. D

    Calculating Initial Velocity and Acceleration of Passing Cars

    A red car and a green car move toward each other in adjacent lanes and parallel to an x-axis. At time t=0, the red car is at x=0 and the green car is at x=220. if the red car has a constant velocity of 20km/h, the cars pass each other at x=44.5m and if it has a constant velocity of 40km/h, they...
  28. A

    Calculating Arrival Time and Distance for Two Cars on a Highway

    Two cars travel westward along a straight highway, one at a constant velocity of 85 km/h, and the other at a constant velocity of 107 km/h. a) Assuming that both cars start at the same point, how much sooner does the faster car arrive at a destination 18 km away? An- swer in units of...
  29. B

    Can anyone explain kers in formula one cars?

    can anyone explain kers in formula one cars? like how it works on a mechanical level. and the difference between flywheel and electrical kers.
  30. W

    Cars Powered by Water: Real or a Myth?

    Is this stuff real? :bugeye: http://www.youtube.com/watch?v=KZOsOB3z3IE&feature=related
  31. P

    Two cars driving 30 and 40 mi/hr is like hitting a brick wall at 70 mi/hr

    I hear this from people sometimes. Upon hearing about a bad head on collision, I will hear a person promptly add the two speeds together and claim the wreck for the drivers is as bad as slamming into a brick wall with that new speed (S = s1+s2). Is this really a good analogy? I'm not so sure it...
  32. J

    News Exploring the CARS Program: Who Does it Benefit?

    I was wondering what people thought about the CARS program. http://www.cars.gov/ It is a program with niche audience and clearly ill advised. Who is it for? The only thing I imagine it could do is drive the price up of used junkers cars due to people hoping to buy one cheaply but less than a...
  33. D

    Two cars in different directions

    Homework Statement Two cars drive on a straight highway, at time t= 0, car 1 passes mile marker 0 traveling due east with a speed of 20 m/s. At the same time, car 2 is 1 km east of mile marker 0 traveling at 30 m/s due west. Car 1 is speeding up with an acceleration of magnitude 2.5 m/s^2...
  34. C

    Maximum distance apart from both cars before Car B catches up with Car B

    Homework Statement Car A travel at uniform velocity at 20 metre per second from t=0s. Car B starts with 5 metre per second during t=0s and accelerates uniformly to 30 metre per second in t=30s.It travels at constant velocity of 30 metre per second from there onwards Homework Equations The...
  35. W

    Newton's laws of motion and cars

    I kinda need help on this question because i can't find any article or references and please explain how the 3rd law related to safety devices in cars. Question: Access the design and use of injury prevention devices in cars in terms of Newton's laws of motion.
  36. Cyrus

    One more reason why I hate American Cars

    Not only are they ugly and break down, they screwed their own dealerships left and right! Why anyone would every buy an American car again boggles my mind. The shut down dealerships and ruined those buissness owners lives without a care. Just for that, I'll never, ever buy a GM car as long as...
  37. edward

    NY Times Slide Show of Reader's GM Cars

    The good the bad and the ugly. http://www.nytimes.com/slideshow/2009/06/01/automobiles/01GM_USER_SLIDESHOW_index.html
  38. D

    Understanding Capacitors in RC Cars - Demson

    i dismantled a Remote controlled car for its parts and i saw on the electric motor some small capacitors. thats a diagram i know what a capacitor is but in this instance what is its actual purpose? help me please Cheers Demson
  39. B

    Five train cars and their final speed

    Homework Statement Three identical train cars, coupled together, are rolling east at 1.13 m/s. A fourth car traveling east at 6.43 m/s catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples...
  40. rcgldr

    Can VW Bugs Really Run on Water? Experiments and Possibilities

    Ok, a bit misleading title, but interesting: http://www.youtube.com/watch?v=PW9gNaPDghw&fmt=18
  41. T

    Questions About Aerodynamics and Flying Cars- Help

    Sorry i didn't know where else to ask this so I'm hoping you guys can help anyways. If a air moving over a wing causes lift then why do planes need to move in order for this to happen. What i mean is instead of moving in order for the air to pass the wing why can't we "blow" air at fast speeds...
  42. wolram

    How these are coupled to the engine on F1 cars?

    Any one know how these are coupled to the engine on F1 cars? http://www.greentechmedia.com/articles/shock-therapy-cars-to-get-electro-power-boosters-5159.html They seem to work well for overtaking.
  43. Z

    Race cars - Torque vs Hp - The Undiscovered Country (for many)

    We have some unbelievable discussions regarding the acceleration of race cars. At first glance, many just look at what they remember, F=ma and go on long rants regarding engines that have high levels of torque. However, even when you rearrange the term to a=F/m, its still a Force at the...
  44. G

    How Does Mass Affect Distance in a Two-Cart Air Track Experiment?

    Homework Statement Two carts are set up on an air track with a rubber band connecting them. The carts are pulled just slightly more than the length of the relaxed rubber band. Upon release, mass 1 travels a distance of x1 and mass 2 travels a distance of x2. Show that...
  45. S

    Are Electric Cars the Future of Transportation?

    Am trying to know*how electric cars could be more desirable to own and the public views on the future of electric cars? [spam deleted]
  46. J

    Momentum Change in Perfectly Inelastic Collision: Comparing Cars and Trucks

    Homework Statement A compact car and a large truck collide head on and stick together (perfectly inelastic collison). Which vehicle experiences the larger momentum change? Which vehicle experiences the larger acceleration during the collision? Explain your answers. Homework...
  47. F

    Thermodynamics, cars colliding

    Homework Statement Two cars collide head on while each is traveling at 80 km/hr. Suppose all their kinetic energy is transformed into the thermal energy of the wrecks. What is the temperature increase of each car? (Assume each car's specific heat is that of iron) Homework Equations K =...
  48. F

    Two cars collide, find temperature change

    Homework Statement Two cars collide head on while each is traveling at 80 km/hr. Suppose all their kinetic energy is transformed into the thermal energy of the wrecks. What is the temperature increase of each car? (Assume each car's specific heat is that of iron) Homework Equations K =...
  49. A

    Easy question about weight transfer of cars

    Why does the weight of a car transfer to the back when accelerating and the front when braking? I'm assuming it has to do with torque, but where is the force acting and how? I'm probably missing something really obvious
  50. B

    Permutations and Combinations people and cars

    Homework Statement A family of nine has two vehicles, each of which can hold a maximum of five people. Homework Equations How many different ways are there of allocating people to the cars? If three of the memebers of the family only have a drivers licence, how many different ways...
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