Excessive force from a seat belt can break the ribs and damage internal organs. Bubble wrap packaging has the same effect and is used to protect objects that are being transported. 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.
The photograph shows what can happen to a passenger in a collision. Although the part of the vehicle containing passengers is rigid to give them protection, the front and rear are crumple zones.
People the driver and passengers inside a car that crashes are also exposed to a large force and this can cause injuries.
Airbags are bags which inflate very quickly during a crash. Airbags are mis-named as they do not use air.
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. The car is designed so that the structure of the car will give way during a collision.
Airbags are designed to restrain a driver and passengers without any risk of causing physical damage to the person. Car seatbelts protect people in two ways during a crash. As the name implies, the crumple zone should squash during a collision.
Seat belts prevent this from happening. Despite what the television advertisements say, this is not the case!
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.
There is less space in front of the driver than there is in front of the passengers because of the steering wheel. The bag only operates during a rapid deceleration such as a head-on 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. 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.
The previous two pages show that than a car that has stopped safely by braking. 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. The Change in Momentum and Car Safety.
How do Seatbelts work? This releases a gas which causes the bag to inflate and surround the driver or passenger like a cushion. An inert gas such as nitrogen or argon is used to inflate the bag within 0.
Seat belts can still inflict severe injuries during a 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 stretching increases the amount of time it takes the person to stop.
To be effective a seat belt should: This has two effects: Quick revise When the velocity of a car changes, that of the people inside it has to change too.Safety Device Description (momentum and inertia) Safety Device Description (momentum and inertia) Assessment of Safety Preliminary Physics - Car Safety Devices.
These two safety features will be found in most or even all modern cars. Airbags is a restraint that is used to prevent the driver, of the car, does not hit the dashboard and the steering wheel, which could cause serious injuries to the neck and head.
Airbags will help the driver if he/she is wearing a seatbelt. Car Safety; Title. Car Safety Seat belts prevent this from happening. However, In modern cars this is designed to collapse on impact. 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. Car Safety- Physics: PHYSICS OF SEATBELTS VICTOR VIGODSKI.
The task of the seatbelt is to stop you with the car so that your stopping distance is probably 4 or 5. 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.Download