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Originally Posted by flappist
And again you miss the point completely.
The colission is not instant it takes time.
At the initial contact there is no energy transfer.
I try to push the ball.
The ball trys to push me.
As I push the ball I slows down.
As the ball pushes me it slows down.
My energy is expended
Its energy is expended.
The ball stops and I stop.
The ball has half the damage and I have half the damage.
At no time does the ball extend past the the impact point.
It is not pushed back nor does it push forward.
The force of the ball is the same as the force of me, otherwise the impact would move.
Therefore the ball acts like a wall fixed in position and the only force I expend is my own force.
The ball expends its own force in stopping.
Rather that argue until you are blue in the face, why not ask others (ones who are prepared to show proofs or equasions not ones that run and hide) who actually work things like this out for a living.
I have.
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Agreed! The collision is not instant, it takes time.
Car drives into wall at 100km/h and stops. Forces required? Over what period of time? Both car and wall experience the same force.
Two men decide to go bungee jumping. The first selects a elastic rope (bungee cord) as his method of connection to the mounting point, the other selects a steel wire rope. Both men reach terminal velocity during their fall and reach a stop at the end of their fall. Neither connection method to the mounting point fails and neither man hits the ground, yet while one man has an exhilarating experience, the other dies. Why?
Forces required? Over what period of time?
Car drives into wall at 100km/h and stops.
Car traveling at 100km/h drives into another car exactly the same traveling in the opposite direction at 100km/h and both stop.
There is no doubt that the wall and the car exert the same force over the same period of time on each other.
The two cars involved in the two car collision exert the same force over the same period of time on each other.
BUT - Do the car hitting the wall and the car hitting the other car apply the same force over the same period of time during their independent collisions?
This is why you need to consider the relative velocity.
I know I said it before, but now I am finished.