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. I

    Friction Cars Racing - 200m Race Results

    Homework Statement Two cars are going to begin at rest and race 200 meters to a stoplight. One driver sneaks over and puts oil on the other car's tires, which reduces it coefficient of friction to .07. Assuming the first car does not slip then by how much distance will it win? Homework...
  2. A

    News Electric Cars, plug-ins? Why not CNG?

    Natural Gas, It's the only logical substitute to Crude Oil. The mechanics of the vehicle are almost identical to gasoline, base infrastructure is already in place (pipelines), Although the major Oil producers also produce Natural gas, the US has reserves that match that of Saudi Arabia and UAE...
  3. M

    How Do Mass and Speed Affect Kinetic Energy in Cars?

    Kinetic Energy and cars... Please help Homework Statement One car has twice the mass of a second car, but only half as much kinetic Energy. When both cars increase their speed by 6.0 m/s, they then ave the same kinetic energy. What were the original speeds of the two cars. Homework...
  4. Ranger Mike

    Two Car Cars Drafting: Exploring Air Resistance

    two car cars "drafting" As posted by Hootenanny on another topic..he kindly replied "the car also experience fluid resistance or drag. For large objects traveling at high speeds the magnitude of the drag force is considered to be proportional to the square of the velocity of the car." Is the...
  5. M

    Motion of Two Cars: Velocity Calculation in Same Direction - 1 km/h

    Homework Statement A ford is traveling at 59 km/h while a Holden has a speed of 60 km/h Calculate the velocity of the Holden relative to the Ford when they are traveling in: in the same direction The Attempt at a Solution 59+60 = 119 km/h However the answer is 1 km/h...
  6. O

    Cars: questions, opinions and maybe some answers.

    I'm leaving it to me to start a thread on cars, I hope I put it in the correct part of the forum. None the less, I'll start with a point than I'll start to ask a few questions and expect some opinions and answers. I can't drive automatic. No, it's not a type or a joke, I just can't do it. I...
  7. T

    Cars & Torque: Flywheel to Drive Shaft

    Some buddies and I were discussing cars and their torque. We were wondering why the amount of toruqe that is exerted by the flywheel is not the same amount of torque at the end of the drive shaft. Does it have something to do with the longer the drive shaft the less torque? or does it deal with...
  8. Z

    Rotational dynamics of two cars

    Homework Statement Two cars race around a circular track. Car A accelerates at 0.340 rad/s2 around the track, and car B at 0.270 rad/s2. They start at the same place on the track and car A let's the slower-to-accelerate car B start first. Car B starts at time t = 0. When car A starts, car B...
  9. K

    HELP Cars collision problem

    HELP!Cars collision problem Homework Statement You are a police officer analyzing the scene of a collision. On a rainy afternoon, a Porsche Carrera, of mass 1380kg, was traveling due north along Hwy38 near Verona, Ontario when a 2304kg SUV pulled out of a driveway (travelling due west) in...
  10. M

    Relative velocity - two cars

    Homework Statement how long does it take a car traveling in the left lane at 60 km/h to overtake another car traveling in the right lane at 40 kn/h when the cars front bumpers are initially 100 m apart? Homework Equations relative velocity equations V ab = v ae + V be The Attempt...
  11. R

    ORC for waste heat recovery in cars

    hi there...to all the enthusiastic people of thermodynamics/thermal engineering. I am working on a project to recover the exhaust heat of a car,for which i require a great amount of guidelines from ur side.firstly,I am not sure as to how much of heat is wasted through the exhaust. Do u think i...
  12. S

    Cop A Catches Thief: Time to Catch & Calculation

    Homework Statement A thief steals a car in front of two cops, A and B. The thief's initial velocity is 25m/s, cop A starts his car with 3m/s2, and cop B starts 10 seconds after cop A, but with 5m/s2. After 200m from his initial point, the thief notices the cops and start accelerating at 1m/s2...
  13. N

    What is the time taken for these 2 cars to meet?

    Homework Statement Two cars, P and Q, are 1400m apart. P is traveling at 15 ms-1, Q is accelerating from rest at 5.0 ms-2 They are traveling opposite direction(i.e. they are facing each other), what is the time taken for them to meet? Also, what is the distance traveled by each car before...
  14. P

    Cars, Ropes, Forces and Bisecting Angles

    SOLVED Homework Statement A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the = 34.0° angle. The magnitude of the force applied by each rope is 3500 Newtons. (I attached the image...)...
  15. A

    When and Where Do Two Cars Collide? A Velocity Analysis

    Homework Statement Two cars are at rest. Car A is at x=2500m, and Car B is at x=-1000m. At t=5s car A instantly travels at a constant velocity of 25 m/s in the positive x direction. At the same time car A takes off, car B travels at a constant velocity of 30 m/s, also in the positive x...
  16. M

    Velocity and Acceleration of Cars

    A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 230 m. If the red car has a constant velocity of 24.0 km/h, the cars pass each other at x = 45.5 m...
  17. P

    Cars moving toward each other problem involving constant acceleration

    1. a red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 240 m. If the red car has a constant velocity of 21.0 km/h, the cars pass each other at x = 47.5...
  18. C

    Two cars meeting - acceleration?

    A car is traveling at a constant speed of 30 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two cars meet for the...
  19. S

    Question on electric cars coming in the future

    Hi. I've been planning to get an electric car around 2010 or after when most manufacturers will have cars out. After some searching I've seen Chevy will have their Volt which can go 40 miles on a charge. Mitsubishi is making one (the Colt) that will go 90 miles on a charge. I'm not sure of the...
  20. P

    Crumple Zones & Car Safety: How F=ma Applies

    How do crumble zones on cars work in relation to Newton's 2nd Law (F=ma)?
  21. E

    How Do Bumper Cars Illustrate Basic Physics Concepts?

    [SOLVED] bumper cars and physics My group assigned me to make a graph of anything relating to bumper cars. They weren't very specific. I was thinking something that has to do with momentum and force or acceleration and momentum, or impulse and monoentum, but I'm not sure what would make sense...
  22. wolram

    How Do the Weight of Batteries Compare to Tanks in Air-Powered Cars?

    http://www.popularmechanics.com/automotive/new_cars/4217016.html India’s largest automaker is set to start producing the world’s first commercial air-powered vehicle. The Air Car, developed by ex-Formula One engineer Guy Nègre for Luxembourg-based MDI, uses compressed air, as opposed to the...
  23. A

    Solving a Linear Motion Question: Two Cars, 70km & 4.4m/s & 2.5m/s

    i have a problem solving a linear motion question, this is the question two cars moving in a straight line of 70km with velocities 4.4m/s and the other 2.5m/s. when will they meet if a) they moved towards each other b) they moved in the same direction.
  24. J

    Aerodynamics and wind resistance of racing cars

    I understand very little of aerodynamics. Currently, my high school robotics team is designing a F1 model. Concerning aerodynamics, how do you use the Bernoulli's Equation regarding the design of the model car?
  25. K

    What are the effects of different braking scenarios on cars and occupants?

    For each part of this question, consider a vehicle that is traveling at a speed of 30m/s and then stops as described. a) The vehicle stops under normal braking conditions over 100 metres. b) The vehicle stops due to a collision when there are ineffective crumple zones (e.g. the vehicle is a...
  26. N

    Some Kinematics questions with cars and satallites

    Having difficulty with the followingCalculating this collision, as the standard equation does not apply, i don't think. Question 1: A 2000kg car traveling at 24 m/s EAST (x), collides with a 3600kg truck traveling at 10m/s SOUTH(y). What is there velocity immediately after impact...
  27. C

    Relative velocity of two speeding cars

    Homework Statement Given the following conditions, what is the relative velocity of 2 cars if their ground speeds are 80km/h for Car A and 45 km/h for Car B? a) both cars are heading in the same direction, A behind B in the reference frame of A b) Use the reference frame of B for part A) c)...
  28. G

    Starting from rest several toy cars roll down ramps at different

    Starting from rest several toy cars roll down ramps at different lengths and angles. Rank them according to their speed at the bottom of the ramp from slowest to fastest. Car A goes down a 10m ramp inclined at 15 degrees, Car B goes down a 10 m ramp inclined at 20 degrees, car C goes down a 8...
  29. K

    Will there ever be nuclear powered cars?

    Let's say 100 years from now... or 200. Whatever. Is it theoretically possible to make a fusion reactor the size of a small box... or a soda can? And if this could be possible, will the tech be purposely hidden or outlawed because it'd mean easier access to small nuclear bombs for terrorists?
  30. J

    IR Lap Counter for RC Cars - Need Help

    I've seen the designs using the 555 timer as the base and making a 2 led IR emitter. These examples use 5v and only two leds to send the 40k signal. http://www.reconnsworld.com/ir_ultrasonic_555timer40khzir.html I would like to modify this design to run off 12v and use 8 infrared leds. I...
  31. DaveC426913

    Possible Interference Between Key Fob Signals and Other Cars?

    I came out to my car (a Chrysler) the other day and went to open my doors using my key fob when I noitced that the SUV (not a Chrysler) parked between me and my car flicked its lights. I was about six feet away from the SUV. Every time I pressed my buttons, be it lock, unlock or trunk, this...
  32. F

    Constant Acceleration of Two Cars

    [SOLVED] Constant Acceleration Homework Statement Two cars are traveling along a straight road. Car A maintains a constant speed of 80 km/h and car B maintains a constant speed of 110 km/hr. At t=0, car B is 45 km behind Car A. A) How much farther will car A travel before Car b overtakes...
  33. Greg Bernhardt

    Why aren't hydrogen fuel cell cars more popular than conventional batteries?

    Enuma's thread got me thinking why these isn't more buzz for the hydrogen cars like the Honda FCX, GM Sequel, Nissan Frontier, BMW 7...
  34. L

    Calculating Combined Mass Motion of Two Cars

    Homework Statement Car A with mass 2400 kg is moving along a straight stretch of road at 45 miles per hour. Car B with mass 1100kg follows with speed 65 miles per hour. How fast is the center of mass of the 2 cars moving? Homework Equations Xcm=(M1X1+...+MnXn)/ (M1+...+Mn) The...
  35. M

    Two cars traveling toward each other question

    An ongoing argument that i can't seem to settle. Say two identical cars with the same total weight are traveling at each other at 100km/h and hit head on. Would this be the same as one vehicle hitting a brick wall at 100km/h or would the speeds combine and come to 200km/h? Assume...
  36. W

    Compare the efficiency of two cars.

    Fill the tanks with the same type of gas. Determine how many miles they travel. Fill the tanks again. Determine the gas consumed by each. Calculate the equivalent amount of energy spent by each car (I need the equivalent amount of energy per gallon of gas). Calculate the energy per mile consumed...
  37. K

    Paint on cars that change colour

    i was wondering what this type of paint (the type you see on cars that changes colour as the car moves around) is called? and more importantly, how it works? is it just the different shades of light that reflect the different colours?
  38. kach22i

    Cars Tires Slashed: DISCOUNT TIRE Experience

    Cars Tires Slashed I had parked both of my cars on the street in front of my house, each had one rear tire stabbed in the sidewall by a knife, I'm guessing sometime late Sunday night. The Geo Tracker only gets 2,000 miles a year put on it, the 4-year old tires looked almost new. Discount...
  39. K

    Solving Car Crash: Speed of Car A When Hitting Car B

    You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is θ = 12.0°, that the cars were separated by distance d = 25.5 m when the driver...
  40. K

    Solving Two Crashing Cars Problem - 11.3152 m/s

    You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is θ = 12.0°, that the cars were separated by distance d = 25.5 m when the driver...
  41. B

    What is the velocity of the cars right after the collision?

    Homework Statement A 1500 kg car moving east at 17 m/s collides with a 1610 kg car moving south at 15 m/s and the two cars stick together. (a) What is the velocity of the cars right after the collision? (b) How much kinetic energy was converted to another form during the collision...
  42. S

    Exploring the Mechanics of San Francisco Cable Cars

    The cable cars in San Francisco are pulled along their tracks by an underground steel cable that moves along at 9.5 mph. The cable is driven by large motors at a central power station and extends, via an intricate pulley arrangement, for several miles beneath the city streets. The length of a...
  43. S

    How Does Friction Both Propel and Slow Down a Car?

    Homework Statement Describe how friction propels a car forward, then explain how friction slows a cars forward motion anyone have any idea?
  44. 4

    Comparing Cars A and B: Who Wins the Race?

    Homework Statement Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the starting line at t=0. The starting line is at x=0. Car A travels at a constant speed Va. Car B starts at the starting line but has...
  45. baywax

    Clean Trains in Japan & Wind Powered Cars

    I believe this has just been tested (again) yesterday (Sept 17th/07) From: http://www.scenta.co.uk/scenta/news.cfm?cit_id=1217038&FAArea1=widgets.content_view_1&search_text1=&startrow1=16 The electric car just got a boost from the power generated by its own wind...! Article from JCNNetwork...
  46. A

    Mousetrap Cars, Various thoughts that need clarification

    Let me start off by saying I'm not 100% certain that this is the correct forum for this to be posted in, if I'm incorrect in doing so, I apologize. I've found several threads previously discussed about mousetrap cars, none of which answer the questions I have. I have four days to design...
  47. M

    What is the relative velocity of two cars traveling in the same direction?

    Homework Statement Two cars, A and B, are traveling in the same direction, although car A is 186m behind car B. The speed of A is 24.4m/s, and the speed of B is 18.6m/s. how much time does it take for A to catch B? Homework Equations Va+Vb=Vab, x=1/2(V0x+Vx)t The Attempt at a...
  48. H

    Statistics - A cars normal acceleration

    Hello, I'm looking for some sort of velocity time graph/table, which illustrates how a car accelerates in a range of 5 seconds or so. I'm trying to figure out at what point the car's acceleration will be higher than a runners acceleration. (It's only a matter of time before the car can overpower...
  49. K

    Hot Wheels Racing: Factors for Fast Cars & Modifications

    I'm interested in the physics behind racing Hot Wheels cars. When you release the cars from an incline, what makes some cars go faster than others? What would be the most important factor of a fast car (ex. weight, aerodynamics, etc.)? How could I modify a car to go faster? Thanks!
  50. N

    When Will the Car Catch Up with the Truck?

    A car capable of a constant acceleration of 4.85 m/s^2 is stopped at a traffic light. When the light turns green, the car starts from rest with this acceleration. At the very same moment, a truck traveling with constant velocity 17.2 m/s passes the car. As the car's velocity increases, it...
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