Originally Posted By: paul

because even if its 1000000 km long and you only compress it to 40N , 40N is all you can get out of it.

Yes but that doesn't stop it gaining a lot of momentum (and speed). We must be talking about different things. In my world if you push something frictionless, it accelerates. And it keeps on accelerating as long as you keep pushing it. It doesn't matter if you're wearing spongey gloves or you're holding a spring, you still push it, and it still keeps getting faster and faster as long as you keep pushing it.


Here I've replaced your "push" with the conventional words having the same meaning:


the 10 kg mass hit the wall at a velocity of 2 m/s with a push/impulse of 20 kg m/s.

the mass has a push/momentum of 50 kg m/s

the mass is accelerated to a velocity of 10 m/s/s
by a push/impulse of 500 kg m/s

push/force = mass x acceleration

500P/N = 50 kg x 10 m/s/s

push and pull replacing both force and momentum inconsistently.