When travelling at slow speeds in your car the wearing of a seatbelt has little effect of your body when you brake. So why is it important to wear your seat belt? .
A driver or passenger travelling in a car is moving at the same speed as the car. If the car suddenly stops, the body of the rider inside will keep moving forward at the same speed. This demonstrates inertia. The tendency of a moving object to keep moving, or of a stationary object to remain at rest. Basically Newtons first law; that a body stationary or moving with constant velocity will want to continue to do so, unless acted on by a force. .
Lets understand what is happening here. First drive along in your car at 60 km/h on a backstreet with no traffic, then brake gently and slowly. You will notice that the seat belt doesn't really do much to hold your body. Now do the same again but this time break as quickly and sharply as you can. Your body will be thrown forwards with great force, and your seatbelt will be literally holding you in place. .
Now your body was what is commonly referred to as being "thrown forwards", however this is not the case. Your body was actually not slowing down much at all and your velocity relative to the car initially was much greater. The car began to slow down due to breaking and your body in accordance with Newtons First law wanted to continue to move at the original constant velocity. Now if your seat belt was not there to provide an opposing force, to your momentum and inertia, by holding you from going forwards, you very likely would have been thrown into the dash or steering wheel. .
Lets look at this mathematically. .
m= your mass in kilograms for this purposes 70kg .
V= final velocity 0 m/s .
U= initial velocity 60 km/h or 16.6 m/s straight line .
S= distance taken to stop 42 m .
t= 3.8 .
a= -4.368 m/s/s .
Now your momentum at 60km/h is P=MU .
So P= 70kg*16.6m/s .
P=1162 Kg m/s .
Impulse I=MU/t .
I=70*16.6/3.8 .
I=305N .
So your body will weigh about 610kg when you are breaking hard, a force it is difficult for any person to withstand.
I personally know the value of a seatbelt all too well. ... With all the devastating statistics and laws in many states requiring the use of seatbelts- 1 in 4 Americans still do not wear a seatbelt. ... Simply put- seatbelts save lives. ... People choose not to wear seatbelts for various reasons. ... There is simply no logical reason not to wear a seatbelt. ...
The speech, "Seatbelts: A Habit That Could Save Your Life,?... The main points of Andrew's speech included the National Highway Safety Administration's statistics for seatbelt use, and its effects, extent of seatbelt protection, and reasons why people do not wear seatbelts. ... While discussing seatbelt protection, he mentioned a couple statistics. ... He easily could have been injured just the same, if not more if he were wearing his seatbelt. ... That would have shown that not wearing seatbelts is common and that the people who get in accidents without their seatbelt on, get in...
Effects of wearing a seatbelt Many people do not realize the effects of wearing a seatbelt in an automobile. ... Seatbelts provide the greatest protection from ejection. ... Although the seatbelt is not guaranteed to save a life, the chance of saving a life is greater than without wearing the seatbelt. ... While seatbelts do occasionally contribute to serious injury or death, wearing a seatbelt significantly increases the chance of survival. ... Each situation is different, and although in some circumstances the seatbelt causes the injury to the person, the injuries from not wearing the seatb...
When traveling at slow speeds in your car the wearing of a seatbelt has little effect of your body when you brake. ... Your body will be thrown forwards with great force, and your seatbelt will be literally holding you in place. ... With this amount of inertial force it is impossible for anyone not wearing a seatbelt to stay in his or her seat. ... Those with their seatbelts on may suffer small abrasions and haematomas (bruising.) ...
Table of Contents: *Introduction- Page 3 *History of the Seatbelt- Page 3,4 *Reasons to Wear a Seatbelt- Page 5 *THINK!- Page 6 *Reasons not to Wear a Seatbelt- Page 6 *Facts about Seatbelts- Page 7 *Conclusion- Page 7 Laws should be passed in all states that require all automotive vehicles to wear seatbelts. ... In 1950, NASH formed the first factory-installed seatbelt. ... Since then, many more seatbelt laws and regulations have been passed. ... Always wear a seatbelt". ...
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An example of this type of law is the seatbelt law. The seatbelt law allows policemen to pull a person over on a highway or road to fine them for not wearing a seatbelt. ... Many lives have been saved by seatbelts, but they don't mention how many lives were saved by not wearing a seatbelt. ... Defective seatbelts can cause harm. ... What about older-model cars that have no seatbelts? ...
I hope to convince you why you should always wear a seatbelt. ... The slowest fatal car accident was at 12mph where, of course, the person killed was not wearing a seatbelt. In most cases, if you wear a seatbelt, you will live and walk away unharmed. ... Seatbelts saved the lives of people who were involved in fatal accidents. ... What would you rather do, wear a seatbelt and get into an accident and live to see another day, or get into an accident and die because you didn't want to spend 5 seconds putting on a seatbelt? ...