Skid resistance: This provides a measure of frictional property, micro texture of surfaces, either in the field or in the laboratory. The quantity measured with the portable tester has been termed ‘‘Skid-resistance’’ and this correlates with the performance of a vehicle with patterned types braking with locked wheels on a wet road at 50 km/h. The skidding nature of a road, particularly in wet condition mainly depends upon the surface texture of the road layer. The skid resistance is measured as a skid number and it is then compared with reference value. Lesser the skid number more is the resistance.
In order not to become stranded on the road due to a flat tire, it is important to know the process of changing a tire. Three steps involved in changing a tire are to jack the car up, loosen the nuts and bolts, and to replace the tire with the spare tire. The first step
It is very crucial to eliminate the possible errors and other misalignments. Wheel alignment is the geometrical relationship of the wheel to the vehicle, the other wheels and the road. It provides better handling while driving on irregular and rough roads. Wheel alignment is required to achieve least amount of friction, least
This way, we can take the irresponsible drivers off the road; saving lives, repairs, time and money. Implementing this law would save the lives of thousands including both drivers and innocent bystanders. The Association for safe international road travel say that “Nearly 1.3 million people die in road crashes each year, on average 3,287 deaths a day and an additional 20-50 million are injured or disabled.” Over 40% of those are caused by impaired drivers. They are putting both their own lives and lives of others at
Let the correct pressure of the car tire be 28 psi The normal force acting on the vehicle at a flat surface = 1000*9.8 = 9800N • 28 psi = 28/14.7 bar = 1.9047 bar • 1.9047 bar = 1.9047*105 pa • Contact patch = weight of the vehicle / tire pressure = 9800 / 1.9047*105 = 0.05145 m2 • Rolling friction = Crr * Nf = 0.015 * 9800 = 147.0 N This 147.0 N is the actual Rolling resistance of the vehicle Now if the pressure in the tire drops below 28 psi, the contact patch increases and the calculations are as follows • 27.5 psi = 27.5/14.7 bar = 1.8707 bar • 1.8707 bar = 1.8707*105 pa • Contact patch = weight of the vehicle / tire pressure = 9800 / 1.8707*105 = 0.05238 m2 • If the normal force acting is 9800 N for 0.05144 m2 then the normal force acting for 0.05238 m2 will be Nf = (9800 * 0.05238) / 0.05144 = 9977.1 N • Rolling friction = Crr * Nf = 0.015 *
Importance of car safety Car accidents are increasing rapidly as the world’s population and the use of cars is increasing the death rate due to road accidents is also increasing. According to a research done by the fox news there are about forty thousand (average) deaths annually in United States. Car industries are trying their best to reduce such incidents and are also introducing new safety measures in their cars. Sir Isaac Newton, a physicist who studied motion and discovered the three laws of motion. His first law of motion was inertia.
Once vehicle is started, it must be stopped somewhere. Brakes are applied on the wheels to stop the vehicle. Brake are one of the most important control component of vehicle. They are requires to stop the vehicle with in the smallest possible distance and this is done by converting kinetic energy of the vehicle in to the heat energy which is dissipated in to the atmosphere. 1.1.2 BRAKE FUNCTION There are two main function of the brakes; 1.
Road accidents were the 9th leading cause of death in 2004 and are expected to rise to the 5th place by 2030. The situation in India is worse, with India accounting for the second highest number of road casualties in the world. The population growth remained 15% in India between 2003-13, the accidental
Have you ever thought which might be more suitable for you, motorcycle or a bicycle? There is no doubt that motorcycles and bicycles are one of the easiest and most efficient types of transportations in our current life. Both are one of the best types of transportations these days due to extensive traffic everywhere, it makes our lives easier by getting to places easier and cheaper due to its fuel efficiency. They were both invented during the 19th century, but they started of weak because of the material it was created from wasn’t very helpful at moving from one place to another which made people not to use it as it is used today. Despite having some superficial similarities the differences between motorcycles and bicycles are remarkable.
Like tires, your wheels need some loving, too! Here are some helpful insights on how to maintain the functionality of your car rim. Wash your car regularly Your wheels accumulate heaps of dust whenever you’re out driving on the road. Even if you park your car outside, chances are high that your car wheels are exposed to dirt and other elements. Keeping them clean and gleaming is easy through car washing.