An analysis of seatbelt physics in modern car safety

Viewed from the outside of the car, a passenger appears to have been thrown forwards. How do Seatbelts work?

Despite what the television advertisements say, this is not the case! Although the part of the vehicle containing passengers is rigid to give them protection, the front and rear are crumple zones. Modern cars, and railway carriages, are also designed so that parts of them crush on impact.

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Airbags are bags which inflate very quickly during a crash. The seatbelt also stretches a little, while restraining the person during a crash. Car seatbelts protect people in two ways during a crash.

Excessive force from a seat belt can break the ribs and damage internal organs. This releases a gas which causes the bag to inflate and surround the driver or passenger like a cushion. The car is designed so that the structure of the car will give way during An analysis of seatbelt physics in modern car safety collision.

The photograph shows what can happen to a passenger in a collision. However, a rigid seat belt that caused a passenger to decelerate at the same rate as the car could prove fatal in a head-on collision.

The amount of space to allow stretching, particularly in front of a driver, is limited so the restraining force from the belt can be large. The force exerted on the person is similar to that from a seat belt, but because it is over a much larger area the pressure is smaller.

There is less space in front of the driver than there is in front of the passengers because of the steering wheel. Bubble wrap packaging has the same effect and is used to protect objects that are being transported.

They provide a softer surface like a pillow to prevent the people hitting themselves on hard objects. How do Crumple Zones, Seatbelts and Airbags work? In modern cars this is designed to collapse on impact. As the name implies, the crumple zone should squash during a collision. The stretching increases the amount of time it takes the person to stop.

Quick revise When the velocity of a car changes, that of the people inside it has to change too. There is also a design conflict in deciding on the width of the belt; wide belts exert less pressure than narrow ones but are less comfortable to wear.

An airbag will give way a little when a person hits it and this gives an extra increase to the amount of time it takes the person to stop. During normal driving, the force to accelerate the driver and passengers comes from the seat; it pushes the person forwards to cause an increase in speed and the friction force between the person and the seat is sufficient to slow the person down or cause a change in direction.

To achieve these conflicting aims, seat belts are designed so that they stretch sufficiently to allow the passenger to carry on moving for a short time after the car has stopped, but not so much that would result in the passenger hitting the windscreen or the seat in front.

The Change in Momentum and Car Safety. Below are listed three ways in which safety features try to minimize the force during a crash by making the change in momentum happen over a longer period of time cycle and motorcycle helmets work in the same way.

People the driver and passengers inside a car that crashes are also exposed to a large force and this can cause injuries. The parts of the car that do this the front and the back are called crumple zones.

When would you be better off not wearing your seatbelt?

The seatbelt prevents the person being thrown about in the car, possibly through the windscreen or hitting themselves on the steering wheel or other objects. Seat belts can still inflict severe injuries during a collision.

Seat belts prevent this from happening. The previous two pages show that than a car that has stopped safely by braking. This has two effects: Airbags are mis-named as they do not use air. Airbags are designed to restrain a driver and passengers without any risk of causing physical damage to the person.

The bag only operates during a rapid deceleration such as a head-on collision. The metal of the car will dent, bend and fold during a collision which increases the amount of time it takes the car to stop.

They are designed to be used with a seatbelt.Safety Device Description (momentum and inertia) Safety Device Description (momentum and inertia) Assessment of Safety Preliminary Physics - Car Safety Devices.

Physics Assignment: Car Safety It was made legal that every passenger and driver in a car has to be wearing a seat belt The modern electronic traction. Apr 29,  · If the car came to an abrupt halt after travelling at constant velocity (for example, in a motor vehicle accident) and the passenger was not wearing a seatbelt, they would continue travelling at constant velocity, probably resulting in a collision with the.

This essay is focusing on the safety features inside of the car which protect the driver and passengers and how this is linked to physics.

The car safety features include the crumple zones, seatbelts and airbags. Crumple zones are located at the front and back of a car.3/5(2). Seat Belts and Airbags Lisa M. Wiese seatbelt, airbag, safety, momentum, force, participants collide a toy car and clay passenger with a brick wall several.

Forces and Motion. The Change in Momentum and Car Safety. How do Crumple Zones, Seatbelts and Airbags work?. The previous two pages show that a car that crashes experiences a much larger force.

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An analysis of seatbelt physics in modern car safety
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