car accident

  1. B

    Car crash analysis please help

    1. Homework Statement Your consulting agency, with its extensive knowledge of physics, has been subpoenaed to provide expert testimony at an automobile accident case in civil court. The case involves a crash between a Ford Escort car and a tractor-trailer truck. 1. The police department...
  2. M

    B Hey guys, I'm going to say right up front that I haven't a c

    Hey guys, I'm going to say right up front that I haven't a clue how to do these calculations, but I have a scenario that I would like the math to if anyone can help me figure it out. What I had been able to attempt to figure out doesn't seem tangible? The formulas I had researched/used was...
  3. E

    Car Collision Problem

    1. Homework Statement A car hits another car at rest. Debris is found 6.75m from the cars, the two cars stuck together over a distance of 6.75m, there are skid marks a distance of 312m before the car crash, car 1=2946kg, car2=1232kg, coefficent of friction is .72. Find the initial velocity of...
  4. J

    B How do forces of the tires contribute to car rollovers?

    I'm trying to understand the physics of car rollovers and perhaps what can prevent them in terms of the forces that are involved. According to various diagrams I've seen, there is friction applied by the tires (with some diagrams showing a set of forces acting only on a single tire which...
  5. G

    Clueless and in need of help -- I was the rear car of a 4 car collision

    Hi guys I'm completely useless when it comes to physics and need help with working something out regarding a car accident. I was rear car of a 4 car collision where all cars infront had already crashed. Now the guy infront of me is saying I shunted him which is a complete lie. I was...
  6. S

    Formula One Car's Momentum

    1. Homework Statement Why are formula one cars(except the place where the driver sits) designed to break apart into small pieces very fast? I believe that there is all kinds of things as aerodynamics, but my assignment talks about how the breaking apart mechanism is a safety feature 2...
  7. J

    Force and Energy Question

    1. Homework Statement "You are investigating an accident where a 1500 kg car rolls down a hill with a slope of 8 degrees, a distance of 150 m (measured along the road) and hit a parked van. How fast was the car moving when it hit the van, assuming little friction?" 2. Homework Equations...
  8. O

    Calculating an Accident

    I was in a car accident Friday night and we both claim the other guy ran the red light. I drive a 2005 Audi A4 which is approx. 3205 lbs, I weigh 350. the other guy was in a 96 toyota corolla which weighs 2,553. I was going about 4 mph when the accident occurred, I had been sitting at a red...
  9. F

    Was I born before or after my older sister?

    quote from wikipedia: "According to the special theory of relativity, it is impossible to say in an absolute sense whether two distinct events occur at the same time if those events are separated in space, such as a car crash in London and another in New York. The question of whether the events...
  10. E

    Probability growth with time

    I've been wondering about a simple question that I can't just google and get the answer to. Usually when we calculate probability, we know the number of possible outcomes. Say we toss a coin, there are 2 possible outcomes with one being head and one being tail. So the chance of getting a head is...
  11. N

    Forces in a head on collision

    Hello. I'm a writer going back and doing some fact checking to make an important scene more believable. It involves a character, Lux in the backseat of a jeep which has just suffered a head on collision with a bus. But I think I am doing something wrong because the numbers I get don't seem to...
  12. N

    Conservation of energy for a collision

    1. Homework Statement You are just starting a new job as investigator for the car collision investigation. You assist your superior in order to determine, as accurately as possible, the circumstances surrounding collisions (initial velocity of the vehicles involved, direction vehicles were...
  13. 2

    Colision Investigation Problem

    1. Homework Statement You are starting a job for Montreal Police Colision Investigators. Your boss tells you to file a report on an accident on Notre-Dame Street. There has been an accident involving 2 cars. Your findings are as follows: Numerous debris were found at a distance of...
  14. K

    Kinematics - How fast does the car stop?

    Kinematics -- How fast does the car stop? 1. Homework Statement A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, giving the car an acceleration of -3.50 m/s2. How far does the car travel after the driver put on the brakes before it comes to...
  15. N

    Testifying in a case involving an accident

    1. Homework Statement As an expert witness, you're testifying in a case involving a motorcycle accident. A motorcyclist driving in a 60km/h zone hit a stopped car on a level road. The motorcyclist was thrown from his bike and landed 39m down the road. Was he speeding? 3. The Attempt...
  16. C

    Dynamics- collision of cars problem

    The problem is like this Assume both cars A and B are intially travelling to the right at 98 ft/s. Car A is tailgating leaving very little room between car A and car B. At that instant driver of car B notices a n accident and starts to break witha deceleration of 2o ft/s^2. By the time the...
  17. J

    Do Past, Unrelated Events Affect Future Probabilities?

    For a long time now I've been thinking about something I find odd about probabilities. For example, let's say that I win the lottery, something that is extremely unlikely. What is the probability that I will be struck by lightning? The odds of someone winning the lottery and getting struck by...
  18. W

    Real world problem, need help with KE problem

    What forum should I post this in, my friend died in a horrible car accident, some of us just want more answers I guess... Object A is in straight line motion Object B is static Object A impacts Object B Object A moves straight forward 60 m and rests Object B moves straight forward 76 m and...
  19. F

    Dog damaged neighbors car, want your input.

    Hi PF: So I had an incident with a neighbor about a month ago. The long story short is my dog was on a leash in the back yard, leash was tied to one of those sprial "stakes" that thread in to the ground. The dog saw something (neighborhood is full of squirrels), managed to pull the stake out...
  20. D

    [Game Theory] A pedestrian is hit by a car. How many people will help?

    1. Homework Statement Consider the following social problem. A pedestrian is hit by a car and lies injured on the road. There are n people in the vicinity of the accident. The injured pedestrian requires immediate medical attention, which will be forthcoming if at least one of the n people...
  21. R

    Friction Force and Motion

    1. Homework Statement 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 =...
  22. L

    What is the necessity for the FDIC in the banking system?

    A bank's basic function is to "borrow short and lend long". In other words, it borrows money from depositors over the short term, promising to repay it on demand, while it lends most of that money out over the long term to borrowers, for instance in the form of 30-year mortgages. This...
  23. PsychonautQQ

    Finding center of circle with Polar Coordinates

    1. Homework Statement r=7sin(∅) find the center of the circle in Cartesian coordinates and the radius of the circle 3. The Attempt at a Solution My math teacher is impossible to understand >.< and then the stupid homework is online and crap blah this class but I REALLY want to understand...
  24. V

    How bright is the future of Maglev Cars?

    Hey guys, I made a topic similar to this earlier, but after I was informed that my ideas has several flaws that would prevent it from working, I revised it and researched more about my topic. This is my original idea with several concepts that has changed. I am planning on making a mini-model...
  25. P

    Experiment Suggestions For Friction and Momentum

    Hey does anyone have any good suggestions for an experiment for both of these topics momentum and friction? Because I'm currently doing a physics investigated research task that's about if you go a KM over or mile over it is worse. so i need to do some investigating that links the two topics to...
  26. R

    Car Crash Problem.

    **Not a homework problem but I was directed here** Hello, over the weekend I was involved in a car accident and received a careless driving ticket because the officer believed that I was going an insane amount of speed. My first instinct to react to this would to be to sit down and do the...
  27. G

    Spring Oscillations Problem Question

    1. Homework Statement You have a job at a medical forensics lab investigating an accident at a commuter railroad station. Your task is to determine the response of the safety system that prevented a railroad car from crashing into the station. Because the brakes on the passenger car failed, it...
  28. R

    Problem on Kinetic Friction

    1. A police officer investigating an accident estimates from the damage done that a moving car hit a stationary car at 25 km/h. If the moving car left skid marks 44 m long, and if the coefficient of kinetic friction is 0.68, what was the initial speed of the moving car? 2. Homework...
  29. S

    Accident Reconstruction using Friction, Energy, Momentum, and Work

    (I believe I got this right, but it's necessary context to the next problem.) PROBLEM 1 1. Homework Statement "The police department determined that the force required to drag a 130 N (29 lb) car tire across the pavement at a constant velocity is 100 N (23 lb). Specifications from the truck’s...
  30. R

    Calculating v from v0, frictional coefficients, and angle

    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 = 23.0 m when the driver of...
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