Seatbelts :: essays research papers

When travelling at slow speeds in your gondola the wearing of a seat flush has little effect of your body when you brake. So wherefore is it important to wear your seat belt?A driver or passenger travelling in a railcar is moving at the truly(prenominal) speed as the car. If the car suddenly stops, the body of the passenger 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 upper 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 doesnt really do a lot to hold your body. direct do the same again but this time break as readily and sharply as you can. Your body will be thrown forrader with great for ce, and your seatbelt will be literally holding you in place. presently your body was what is commonly referred to as being "thrown forwards", but this is not the case. Your body was actually not slowing down frequently at all and your upper 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 in that respect 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 run into at this mathematically. m= your mass in kilograms for this purposes 70kgV= final velocity 0 m/s U= initial velocity 60 km/h or 16.6 m/s straight line of workS= distance taken to stop 42 mt= 3.8a= -4.368 m/s/s Now your momentum at 60km/h is P=MUSo P= 70kg*16.6m/sP=1162 Kg m/sImpulse I=MU/tI=70*16.6/3.8I=305NSo your body will weigh about 610kg when you be 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 nigh 0.4 seconds to stop.