Seatbelts

Seatbelts

Length: 726 words (2.1 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
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.

Now in the context of a head on accident at around 60km/hr the force exerted on your body is greatly increased. In the event of such an accident it will take the car approximately 0.4 seconds to stop.

How to Cite this Page

MLA Citation:
"Seatbelts." 123HelpMe.com. 20 Nov 2019
    <https://www.123helpme.com/view.asp?id=85176>.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Seatbelts Essay

- 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....   [tags: essays research papers]

Free Essays
726 words (2.1 pages)

Seatbelts on School Buses: a Necessity or a Daily Threat to Our Students?

- In the late 1920’s, school buses and larger industrial vehicles became a popular source of transportation that started from Ford dealership owner, A.L. Luce. Luce had plans to extend the school bus frame (from a Model T) to accompany more students per one bus. As school buses and city buses became more common throughout America’s cities for daily transportation, safety regulations and precautions were put in place. Safety features, including flashing caution lights, visors outside of the vehicle, and motorized stop signs and stop arms were all installed within the next 80 years to make the journey to and from school safer....   [tags: school transportation, legislation]

Research Papers
1129 words (3.2 pages)

Automobile Faults Rectified Essay

- DIAGNOSIS AND RECTIFICATION OF AUTOMOTIVE AUXILIARY ELECTRICAL FAULT 1.) Airbag: Due to high cost and low effectiveness in the 70’s the airbag temporarily disappeared. People started to call it air-bag instead of airbag. Air meaning ‘Automotive Inflatable Restraint’ and it was designed by John Hetric in the early 60’s. The airbag is made from nylon and is covered in talcum power to prevent things such as friction burn. The gas inside is an inert gas and is normally Potassium Nitrate (KNo3) mixed with Sodium Azide (NaN3) to create Nitrogen (N) or it is filled with Argon (Ar)....   [tags: airbags, seatbelts, electric windows]

Research Papers
1197 words (3.4 pages)

Essay about Should Wearing A Seatbelt?

- There is a massive amount of car accidents that occur every day, that consequently become fatal. In many cases, the driver and the passengers do not have on a seat belt to prevent them from being thrown out of the car or colliding with another car, causing them to be thrown against the dashboard or some other tragic accident. Some people may think, “Wearing a seatbelt isn’t cool”, “I’m only going down the street” or sometimes just irresponsibly forget to put on their seatbelt when they are inside of a vehicle....   [tags: Automobile, Tram accident, Injury, Accidents]

Research Papers
1109 words (3.2 pages)

The Importance of Wearing a Seatbelt Essay

- The Importance of Wearing a Seatbelt We have all heard the excuses before, "It's uncomfortable, I'm only going around the corner", I'd rather be thrown out of a car than be stuck in a seatbelt," and my favorite, "I'm a good driver I don't need to wear one." Well you may be a good driver but there are situations beyond your control such as bad weather, road conditions and not to mention other drivers that can affect your safety. Seat belts can mean the difference between life and death in an auto accident....   [tags: Argumentative Safety Driving Accidents Essays]

Research Papers
978 words (2.8 pages)

Reasons to wear a seatbelt Essay

- “August 2000, our family of six was on the way to a wedding. It was a rainy day, and Gregg was not familiar with the area. The car hit standing water in the high-way, and started hydro-planing. Greg lost control of the car. Then, the car went backwards down into a ditch and started sliding on its wheels sideways. After sliding for 100 feet or so, the car flipped, at least once. After flipping, the car came to rest on its wheels, and the passenger window broke out....   [tags: essays research papers fc]

Free Essays
767 words (2.2 pages)

Teen Driving Hazards Essay

- Early one Saturday morning on Litedoune Road, a nineteen year old named Caitlyn Priced died in a severe car crash at three thirty in the morning. Caitlyn was driving home from a party in Catawba County and was headed to a friend’s house. While driving to her friend’s house Caitlyn was drinking and sending text messages with her cell phone when she crashed. Not only was she drinking and texting while driving, she also wasn’t wearing a seat belt. When Caitlyn crashed she was thrown from the car when the car rolled after she took a turn to fast....   [tags: seatbelt, texting, drinking]

Research Papers
1240 words (3.5 pages)

Pros and Cons of the Mandatory Seatbelt Law Essay

- An enormous division currently exists between the people who believe that automobile safety should be an option and those that feel it must be a requirement. The federal government feels the morally obligated to create the safest driving environment possible. On the other end of the spectrum, opinions exist that the average driver has ability to make the choice of safety on their own. Editorials, political assemblies, debates, and conversations have arrived on the concept of click it or ticket. This idea refers to ticketing any motor vehicle driver and passenger that is not fastened by a seat belt....   [tags: Pro Con Essays]

Research Papers
1453 words (4.2 pages)

seatbelt Essay

- Internet File Sharing and the Music Industry Imagine millions of songs accessible in one place. Today songs are just a few clicks away since the introduction of the internet and file sharing. File sharing is simply taking a file and allowing other internet users to download and use the file permanently. The accessibility and use of file sharing programs has devastated the music industry financially. The fact that almost every song recorded today is accessible through a free program encourages most consumers to download rather than buy....   [tags: essays research papers]

Free Essays
767 words (2.2 pages)

Is It Proper to place someone in jail for a seatbelt violation Essay

- States across the nation have seat belt laws in place that make it a requirement for drivers and passengers in vehicles that are being operated on public streets to wear some sort of safety belt. In 1998, 41,471 people were killed in 6,334,000 reported motor vehicle accidents in the United States. Seat belts are estimated to save 9,500 lives each year, and statistics show a higher degree of seat-belt use in states that aggressively enforce seat belt laws. The laws, as well as the punishments available for violation of the laws vary by state....   [tags: essays research papers]

Research Papers
1523 words (4.4 pages)

Related Searches

This gives an acceleration of –41.5m/s/s. This means the impulse on your body would be equal to:
I=MU/t
I=70*16.6/0.4
I=2905N
So your body would weigh around 300kg.

With this amount of inertial force it is impossible for anyone not wearing a seatbelt to stay in his or her seat. They will either be thrown forwards into the dash or steering wheel, with a force that is capable of crushing skulls or rib cages. Even worse they could be thrown through the windscreen hitting external objects, such as telegraph poles or oncoming cars.

Those with their seatbelts on may suffer small abrasions and haematomas (bruising.) But this is a small price to pay to be able to walk away from a serious crash.

But the seat belt is slack when I put it on, how can it possible protect me?

An inertia-reel seat belt works on the same principle as Newtons First law. Its mechanism includes a pendulum, which hangs vertically under ordinary driving conditions. If the car should suddenly stop, however, it swings forward, and a locking lever resting on the pendulum is released. The lever engages a toothed ratchet that locks the shaft around which the belt is wound. The locked seat belt then prevents the body from being flung forward. When the seat belt is fastened, it winds out from the reel against slight tension from a spring. This keeps it taut during normal travelling, but allows enough free movement for a driver to reach forward as necessary. If the driver tugs on the belt abruptly while winding it out, the locking mechanism will engage and stop the action of the spring. Slackening the belt releases the spring and the locking lever.

So next time you go for a "drive" it is imperative you put your seat belt on to prevent your inertial mass from "driving" you into the windscreen.
Return to 123HelpMe.com