Saturday, May 22, 2010

seat belt!!! hidup dan mati anda!!!

zul actually have to write this post because zul see many friends did not wear seat belt, i have my friends died because involve in accident, my friend from the technic school and there are 2 person died because thrown out during accident happen,her friends try to overtake the express bus,but he turn to left lane too early,so the car, spinning and hit the divider and that 2 person died because thrown out from the car. the body did not have many bleading but since she hit at the head and cause the injury to her

cara2 memakai talipinggang keledar dengan betul ;)

hu because zul before this learn about automotive, zul know about the important of people to wear seat belt,actually in nature, when something moving, there are some force tend to make u still moving, especially when u moving with high velocity and u have a big weight, this force is call inertia 

Inertia is a tendency of all objects and matter in the universe to stay still, or, if moving, to continue moving in the same direction, unless acted on by some outside force. This forms the first law of motion formulated by Isaac Newton (1642-1727). To move a body at rest, enough external force must be used to overcome the object's inertia; the larger the object is, the more force is required to move it
the real comparison advertisment with the nature

that means all the time we do something, there are force tend to fight the direction of the force with exact force we produce, still dont understand? too technical? see the example below

when we do the experiment above, when we move the card, the coin still in that position and then goin inside the glass, its the same thing when we moving in the car when moving and stop suddently,like accident occur. there are the some force of inertia tend to make people inside moving, same thing with the coin but its more dangerous because we have the weight of people and weight of car with high velocity of car and can causes death to the passenger

 haha jgn bli baju nih lak

According to a research report from the National Highway Traffic and Safety Administration, seatbelts save approximately 13,000 lives in the United States each year. Furthermore, the NHTSA estimates that 7,000 U.S. car accident fatalities would have been avoided if the victims had been wearing belts.

luahan hati keluarga mangsa

ha, mcm ni lg bgos!

any time a car comes to a sudden stop, a passenger comes to a sudden stop as well. A seatbelt's job is to spread the stopping force across sturdier parts of your body in order to minimize a safety harness designed to secure the occupant of a vehicle against harmful movement that may result from a collision or a sudden stop. As part of an overall automobile passive safety system, seat belts are intended to reduce injuries by stopping the wearer from hitting hard interior elements of the vehicle, or other passengers (the so-called second impact), are in the correct position for the airbag to deploy and prevent the passenger from being thrown from the vehicle. Seat belts also absorb energy by being designed to stretch during an impact, so that there is less speed differential between the passenger's body and their vehicle interior, and also to spread the loading of impact on the passengers body

A typical seatbelt consists of a lap belt, which rests over your pelvis, and a shoulder belt, which extends across your chest. The two belt sections are tightly secured to the frame of the car in order to hold passengers in their seats.

When the belt is worn correctly, it will apply most of the stopping force to the rib cage and the pelvis, which are relatively sturdy parts of the body. Since the belts extend across a wide section of your body, the force isn't concentrated in a small area, so it can't do as much damage. Additionally, the seatbeltwebbing is made of more flexible material than the dashboard or windshield. It stretches a little bit, which means the stop isn't quite so abrupt. The seatbelt shouldn't give more than a little, however, or you might bang into the steering wheel or side window. Safe seatbelts will only let you shift forward slightly.

when the accident occur, there are high energy that can damage the passenger and the seat belt work together with car crumple zone and all the research of collusion impact use dummy robot and engineer study and absorb the energy, and the study is done with dummy robot use seat belt and the car travel about 64kilometer/hour even the state of art safety technology do not use when u do not use seat belt and thrown out from the car

about 80% people thrown out during accident are dead or badly injured, because they hit directly with the force of inertia

  bayangkan anda tercampak keluar sebegini? dan didepannya lori bawak besi

A car's crumple zones do the real work of softening the blow. Crumple zones are areas in the front and rear of a car that collapse relatively easily. Instead of the entire car coming to an abrupt stop when it hits an obstacle, it absorbs some of the impact force by flattening, like an empty soda can. The car's cabin is much sturdier, so it does not crumple around the passengers. It continues moving briefly, crushing the front of the car against the obstacle. Of course, crumple zones will only protect you if you move with the cab of the car -- that is, if you are secured to the seat by your seatbelt.
ha klo tercampak meninggal mcm ni mcm ne?

when its come to calculation about force occur,

lets calculate the force  

For the car crash scenario where a car stops in 1 foot from a speed of 30 mi/hr, what is the force on the driver? Assume a 160 lb (mass = 5 slugs) driver.
If firmly held in non-stretching seatbelt harness: Stopping distance 1 ft.

  • Deceleration = 967 ft/s2 = 294 m/s2 = 30 g's
  • Force = 4813 lb = 21412 N = 2.4 tons
Non-stretching seatbelt
If not wearing seatbelt, stopping distance determined by nature of collision with windshield, steering column, etc. : stopping distance 0.2 ft.

  • Deceleration = 4836 ft/s2 = 1474 m/s2 = 150 g's
  • Force = 24068 lb = 107059 N = 12 tons!!
No seatbelt!
If seat belt harness stretches, increasing stopping distance by 50%: 1.5 ft.

  • Deceleration = 645ft/s2 = 197 m/s2 = 20 g's
  • Force = 3209 lb = 14274 N = 1.6 tons
Stretching seatbelt
These calculated numbers assume constant deceleration, and are therefore an estimate of the average force of impact.


can my felow friends imagine to get as many 12tonns of force of impact during accident occur and the car only travel about 50km/hour? how about u drive faster and not wearing seatbelt?
so let buckle up our seat belt, jgn degil2 ;)


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