use Newton's laws to explain the safety features of wearing safety-belts?

Question

please include all the laws,equations and units.

Answer 1

Other than what Magneto007 said...You should be more concerned with the Dept. Of motor Vehicles LAWS and just wear then. They will save your life. (Unless you find a way of becoming massless.)

Answer 2

in newton's law of motion when a body in motion tends to be in motion unless acted upon by an external force the car you are travel ling with and you as the driver moves with it so that when the car had abruptly stop the seat belt will hold you back to where you are seated and to complete the law a body at rest will remain at rest unless acted upon by an outside force

Answer 3

Well by newton's law of inertia when your car comes to an abrupt stop you keep moving in the direction your car was traveling unless your seat belt holds you in the seat

Answer 4

An object moving in a straight line at 55 mph will tend to continue moving in a straight line at 55 mph, unless it's acted on by an outside force. Of course, that doesn't describe how strongly it tends to move forward. You have to multiply the object's speed by its mass to measure that (momentum - and you would need to convert the mph to feet/sec).

Only an outside force will change your momentum.

The outside force slowing your car down to 0 mph is a tree. An outside force such as a tree will change the momentum of your car. The amount of force will depend on how much mass is stopped. A well designed car tends to shed body parts in a high speed accident. It increases the amount of damage to the car, but each piece is carrying away a certain amount of momentum, meaning less force will eventually be applied to the remaining pieces of the car. (In auto racing, watch how much of the car's mass separates from the passenger's cage - by the end of a high speed Indy style crash, the cage containing the passenger is about the only thing left). The mass that's not expelled tends to be rapidly compressed like a spring. Springs are particularly good at turning kinetic energy into potential energy - in other words, they absorb a lot of the force of the accident.

Of course, since you're not physically attached to the car, you'll just continue to travel in a straight line at 55 mph and all of that mass expelling and compression won't do you any good at all. You'll smack into a nearly stationary steering wheel. The steering wheel will rotate upwards, but there's still a lot of force applied to your chest, which will be absorbed by your spring-like bones. Well, they're not great springs - they will absorb a lot of momentum, but they'll do it by breaking and your flesh and lungs might have to absorb a lot of that momentum by compressing and ripping.

You'll still be moving pretty fast by time your head hits the windshield. The windshield will absorb a lot of momentum in a spring-like fashion by bulging outward. Unfortunately, the windshield doesn't bulge out fast enough. Your head is slowing down rapidly while the rest of your body is coming behing. Once again, your head and neck will absorb a lot of this momentum in a spring-like fashion by compressing, snapping, etc. Eventually, in less than half a second actually, all of your momentum will have been absorbed by some obstacle that applies some resistive force to your body.

If you're belted into the car seat, your momentum is transferred to the car, thanks to those wide straps that also absorb momentum like a spring. They stretch a little, but the primary advantage is that your excess momentum just makes it harder to slow the entire car. You both slow at the same rate. As previously mentioned, your car has all sorts of ways to rid itself of momentum quickly - all very bad for the car, but better the car than you.

In fact, considering the ratio between your mass and the car's mass, transferring all of your momentum to the car will hardly make a difference in the amount of damage to your car.

Answer 5

force = mass X acceliration
& Accelaration is rate of change of velocity ( a = change in velocity/ time )
as u r sitting in a running car u r under the influence of a force
.Due to change in velocity or speed of car accelaration changed hence u r under the effect of changing force. To reduce the negative effect of the force , safty belts are used

Answer 6

third laws because it tells there is opposite reaction to every action if you wear a seat belt reaction wont be soo hard i mean u wont slam ur head on the steering

Answer 7

what goes up must go down (i think thats newton) but if you wear your seatbelt you cannot go up cause your fastened in