How Tires Work
How it works
they are not really round. There is a flat spot on the bottom where the tire meets the road. This flat spot is called the contact patch. This helps the tire have more space on the ground so that the square inch area touching the ground is higher. By doing this, You don't need as much pressure in the tire. Tires usually only need 30 pounds per square inch. You can figure out how much four tires can hold by adding the square inches touching the ground and multiplying it by four (all tires). Then you must add in the area pressure of all the tires. You find this by finding the area of the tire in square inches and multiplying that by 30.
Related equations
Tire manufacturers sometimes publish a coefficient of rolling friction (CRF) for their tires. You can use this number to calculate how much force it takes to push a tire down the road. The CRF has nothing to do with how much traction the tire has; it is used to calculate the amount of drag or rolling resistance caused by the tires. The CRF is just like any other coefficient of friction: The force required to overcome the friction is equal to the CRF multiplied by the weight on the tire. This table lists typical CRFs for several different types of wheels.
Tire Type Coefficient of Rolling Friction
Low-Rolling Resistance Car Tire 0.006-0.01
Ordinary Car Tire 0.015
Truck Tire 0.006-0.01
Train Wheel 0.001
Let's figure out how much force a typical car might use to push its tires down the road. Let's say our car weighs 4,000 pounds (1814.369 kg), and the tires have a CRF of 0.015. The force is equal to 4,000 x 0.015, which equals 60 pounds (27.215 kg). Now let's figure out how much power that is. If you've read the How Stuff Works article How Force, Torque, Power and Energy Work, you know that power is equal to force times speed. So the amount of power used by the tires depends on how fast the car is going. At 75 mph (120.7 kph), the tires are using 12 horsepower, and at 55 mph (88.513 kph) they use 8.8 horsepower. All of that power is turning into heat. Most of it goes into the tires, but some of it goes into the road (the road actually bends a little when the car drives over it).
That is to say, that the rock at the top of the tire may be going twice as fast as car itself. Similarly, at the point of contact of with the road, the velocity of the rock is 0.
Unfortunately, with high speeds comes high fuel expenditures. Someone Driving at 70 miles per hour uses much more gas than that of someone driving at 55. For example, a businessman who must travel all over the United States is forced to fill up his gas tank often. However, if this same man goes at a safe speed of 55. then he will not need to fill up nearly as much.
A pit crew consists of two tire-carriers (front and rear), two tire-changers (front and rear), a jackman and a gasman. The rear tire changer Removes and replaces the right rear tire, using an air-powered impact wrench on the five lug nuts. He then moves to the opposite side of the car to change the left rear tire. The rear tire changer assists the rear tire changer by handing him a new tire that he's carried from behind the pit wall. He may also adjust the rear shock/jack bolt to adjust a car's handling then move to the other side to carry the other rear tire. The front tire changer and tire carrier does the same thing as the rear just on the front of the car. The jack man operates a 20-pound hydraulic jack that raises the car for tire changes. After new tires are first bolted to the right side of the car, the jackman drops the car to the ground and repeats the process on the left side. The gas man empties two 12-gallon dump cans, which weigh 81 pounds each, into the car's fuel cell. The Pit crew does all of this in under 13 seconds which is about the time it takes for one NFL play or how long it takes for you to walk to the fridge to get another beer. In an autopsy of the pit stop done by Sport Science they broke down the pit stop: The jack man gets to the car and has to precisely center the jack under a ¾ inch bolt raising the car before the tire changer removes all five lug nuts in about one second then tightening the new lug nuts in about the same speed. The entire crew explodes to the other side of the car to do the same to the driver’s side of the car. The gas man empties all 12 gallons of fuel in about five seconds. Just to put into comparison if you have ever changed a tire on the side of the road or even had the luxury of working in a shop it takes much longer to change one tire than these crews take to change all the tires and fuel up
If the purpose of brakes is to convert kinetic energy into heat, then in order to know how much heat the brakes make requires that we find out how much kinetic energy there is in a moving bicycle.
The Medicine Wheel is a symbolic part of Indigenous culture across the North and South American continents. It is hypothesized that that the Medicine Wheel was the heart of all ways of life. Stone Medicine Wheels have been discovered in the northern plains of the United States and Southern Canada. However, there is no current evidence to explain when and why these teachings began.
While changing a flat tire may seem to be simple enough, there are some safety tips you should know first.
The following steps are the safest way to change a flat tire. If you received a flat tire while driving down the road; first thing to do is to get away from oncoming traffic; at that time, find a place that is well lit, such as a parking lot. Keep in mind the farther you drive on a flat tire, the more damage you will incur to the tire and wheel. Secondly, set the parking brake so that the car does not roll away while the car is off the ground. Then, you have to locate your spare tire, which will replace the flat tire; that is usually in a compartment inside the trunk. The spare tire is secured in place by a bolt or a bracket that unscrews easily. In addition to the spare tire, you will need a jack to raise the car off the ground. The third item you need, is a lug nut wrench that will remove the lug nuts. Place all of the items near the work area. If you have a tarp, lay it on the ground and put some rocks on each corner of it so that the wind will not lift it up off the ground. The tarp gives you something to kneel on; instead, of kneeling on the ground...
The average driver doesn’t think about what keeps their car moving or what keeps them on the road, but that’s because they don’t have to. The average driver doesn’t have to worry about having enough downforce to keep them on the road or if they will reach the adhesive limit of their car’s tires around a turn. These are the things are the car designers, professional drivers, racing pit crews, serious sports car owners, and physicist think about. Physics are an important part of every sports and racing car design. The stylish curves and ground effects on sports cars are usually there not just for form but function as well allowing you to go speeds over 140 mph in most serious sports cars and remain on the road and in reasonable control.
If you find yourself in a situation that requires you to change a tire, then you should refer to this simple nine step guide. Imagine you’re driving down the road and you hear a loud popping noise followed by a slight loss of control of your vehicle. You know in the back of your mind that you’ve blown a tire, but you don’t want to admit it, you’re in denial. You pull over the car and check your tires, you see the flat tire on the driver side of your car right away, your mind spirals into panic. Your palms are sweaty and you’re too embarrassed to ask for help, you don’t know what to do. Then you pull out your phone and Google How to Change a Tire, the first result is from Sean Classen, the world renowned how to writer. After thoroughly reading through the guide you know that you’re set, and confident.
Imagine that you’re driving on an open highway in the middle of summer. All you see in front of you is asphalt for miles and miles. The windows are down and your favorite song comes on the radio. You’re behind the wheel of a Tesla Model S, the newest electric car that can go from zero to sixty miles per hour in 2.4 seconds. This will soon be the future of all motor vehicles. Electric cars are beginning to have colossal impacts on our society because of their energy efficiency, performance benefits, and the fact that they are less harmful to the environment. In the near future, electric cars will dominate the road and eventually the planet’s overall need for oil will decrease immensely.
Cars are large objects of great mass which can reach very fast velocities, this can be a dangerous combination if the physics aren’t correct. Seeing as there is over 1.2 billion cars world wide, physicians have put much detail into aspects of cars to make them as safe as possible. In the paragraphs below I will be be briefly discussing different aspects of the everyday automobile and its safety.
The computer has a major role in determining on how much power the car needs from the electric motor. The electric motor gets the power back from a set of Nickel Metal Hydride batteries. The computer reclaims excess heat from the brakes and electric motor to...
There aren't too many things in life which are more annoying than a flat tire when you least expect it, but then again who really expects a flat. Maybe the bloke driving around on four bald tires is expecting one, but he probably doesn't want one either. Although I will admit that one day on my way to get new tires I tried, and successfully I might add, to "burn off" a tire. Luckily for me though I was within one block of the tire shop, and even more serendipitously the police never caught me on the way there since I would stop for every red light and stop sign only to "light up" the rear wheels upon take off, sometimes reaching 75mph on the speedometer before the tires started to catch and I would end up at a simple slow 30mph.
Today, people use their own personal vehicles to travel more than ever before. Personal transportation is no longer considered a luxury; it is now considered a necessity. The number of cars in the United States has been growing steadily since the 1970s. The number of miles traveled by cars has risen nearly 150 percent, yet the United States population has only grown roughly 40 percent during that time (hybridcars.com, Driving Trends). Although it may seem like we are advancing into the future, in reality, we are moving backwards from the effects these vehicles have on our bodies and the environment. The pollution produced by these vehicles has brought us to the day where we must find other modes of transportation that cause less harm to the world in which we live. Advances in technology have developed hybrid vehicles to try and slow down the amount of pollution. Driving a hybrid vehicle, instead of a conventional gas powered vehicle, can reduce the amount of pollution that affects our lives and the environment around us.
Stenquist explains electric cars might get their energy from coal, wind, nuclear, and solar sources; in addition, these capabilities which improve the environment by reducing the detrimental sources. Stenquist (2012) asserts that electric cars can better reduce the global warming emissions from the gases, which result in a cleaner environment (p. 2). Furthermore, the author interviews several people to