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Some help answer the question about traveling

Suppose a car is traveling in a beeline band at a connected dispatch of 100 km/h, isn't the dispatch of an article traveling at a connected dispatch 0?

Lets aloof say that the car weighs 1,000 kg, F=ma, accept that the car hits a person, wouldn't the force of the appulse be 0 if the dispatch of this connected dispatch is 0? After all 1,000 x 0 = 0

I don't accept this concept, amuse explain why the being would acquaintance a greater appulse than 0 :( Thank you.

The car is not accelerating back traveling at a connected speed, yes, that is true.

But back the car hits something, it is no best traveling at connected speed.

During the blow the car changes dispatch and appropriately accelerates (negatively).

It is THIS neg. dispatch that causes a force F = ma to act on the person.

Add'l comment: Your argumentation and physics proves it absurd for an article traveling at connected speed, to bang an article at rest, and not acquaintance some change in dispatch during collision.Yes, the dispatch of a car that's traveling in a beeline band at a connected dispatch of 100 km/h is 0.

Your additional acceptance is partially inconsistent with the science of an absolute collision. You had a = 0, back dispatch would not be 0 in actuality.

As addition belief this blow would see:

Jim is right. You are, too, about the connected dispatch = no dispatch concept. Dispatch is a change in dispatch (speed and/or direction), and is acquired by a force.

When the car hits someone, it loses some of it's forward-moving velocity. The force that causes this backwards dispatch is the force from the being blame on the car.

The being accelerates back the car hits the person; dispatch hints that a force is involved. The car exerts a force on the being because of the collision. The being exerts a force on the car, noticed in the aforementioned way: the car is accelerated, hinting that a force is complex (if you advised the car, you'd apprehension some backwards acceleration).

I achievement I helped, and I'm animated if I did! I'm blessed to see that you are cerebration about what you learn! That's awesome!The force of appulse on the being depends on the accumulation and dispatch of the PERSON, not the accumulation and dispatch of the CAR. There are two "F=ma" equations here:

(net force on car) = (car's mass)×(car's acceleration)

(net force on person) = (person's mass)×(person's acceleration)

This is added complicated by the actuality that the appulse force amid car and being (let's alarm that "F_cp") ability be alone ONE allotment of the "net" force acting on one or the added object. That is:

net force on car = F_cp + (other armament on car)

net force on being = F_cp + (other armament on person)

So the accepted equations (during the time of impact) would be:

F_cp + (other armament on car) = (car's mass)×(car's acceleration)

F_cp + (other armament on person) = (person's mass)×(person's acceleration)

And you can absolutely set that up so that (car's acceleration)=0 while F_cp is nonzero. For example, if F_cp is 55N and (other armament on car) = -55N, again (car's acceleration) will be aught (car will biking at connected velocity), but the appulse force will still be nonzero.In this archetype you charge not accede what has happened to the car, but what is accident to the person. If you booty an acute case area the car, travelling at 100km/h = 27.7m/s were to hit a being with accumulation 70kg. In this book the car does not change its dispatch at all, but the being is absorbed to the advanced of the car and is agitated forth with the car. Now account the force on the person:

The being will be accelerated from aught dispatch to 27.7m/s in a actual abbreviate time - say 0.10sec. Account as follws:

Acceleration of being :

v = u +at

27.7 = 0+ a*0.1

a = 277m/s²

What is the force appropriate to do this:

Force = accumulation * acceleration

Force = 70*277

Force = 19,390N

It is the force accelerating the being that causes the damage. Of advance in a absolute situation, the being would be befuddled aside, or agape out of the way, but the actuality still charcoal that the being is berserk accelerated from aught dispatch to absolutely a aerial dispatch in an acutely abbreviate time. This is aerial acceleration, consistent in a ample force acting on the person, that causes the accident or alike death.Ok, anticipate of it this way. What is dispatch ? Is the dispatch of a anchored anatomy by analogue 0? The Dispatch of a affective article is not ), correct? Able-bodied if a affective article hits a staionary object, isn't there a change in velocity? I beggarly if a car is activity 100 kph and slams into an adamant article it decelerates adequately bound from 100kph to 0 in a atom of second.

This is a actual simplistic adaptation and in absolute activity both altar the affective and the anchored will advance (+,-).Hi Ican, able-bodied it is VERY difficult to alike accede this abstraction back you are application such incomparable masses. A being is so ablaze (70kg or so) compared with a car, which could counterbalance 1,000kg or more! Try applying the abstraction to two ice pucks on an ice table (or alike two marbles rolling on the floor) and you will readily see the aftereffect on anniversary object, alike if the masses of the ice pucks (or marbles) are altered from anniversary other. The added affair that best bodies assume to accept absent is that such a book invokes attention of drive rather than attention of energy, back the appulse amid a car and a being will account artificial anamorphosis of the car (and the person), so it is simpler to accede attention of momentum, back the deceleration of the car and dispatch of the being is direct (i.e. doesn't action over time).

Cheers