N is not a unit of momentum. So nothing can have a momentum of +4000N
then tell me what is a unit of momentum.
let me ask you a question , if a object that is not accelerating and has a velocity
of 40 m/s , what would its momentum be in your world.
this is really getting old , kallog
http://en.wikipedia.org/wiki/Classical_mechanicsIn classical mechanics, momentum (pl. momenta; SI unit kg·m/s, or, equivalently, N·s)
Obviously the force on the mass is in the same direction, both going into the turn and coming out of it. Similarly for the force on the pipe.
you do understand that you just contradicted yourself by saying the mass has a force on it.
No it doesn't. But our system is frictionless, so the comparable car would require no gas
thats true.
require no gas, whether circling or doing a U-turn or bouncing off a spring, or even stopping with regenerative breaking, then accelerating again. Can you say anything that isn't completely misguided?
even stopping with regenerative breaking, then accelerating again.
so now its just F=m
if it has mass you can accelerate it without a force.
You're ignoring the part where the force used to compress the spring is also, at the same time, accelerating the sail.
Im not ignoring it , I said momentarily !
in fact here is what I said
now apply a -40N force to the spring.
the solar sail feels the -40N force that you apply to the spring , and as you apply the -40N force the solar sails mass resist movement momentarily while you depress the spring.
but you have depressed the spring and if you hold it in with a -40 N force the sail will move away from you.
xxx
If you don't believe me, break open a pen and try pushing the spring. Notice the force is transmitted right through. Use the spring to push something, the thing can be pushed via the spring.
just a minute.
it just so happens that I have one.
ok , now let me go outside to my truck.
........... time passes .....................
nope the truck didnt move !!!
but we were only using a 40N force stored in the spring vs
a 1000000 kg mass.
thats about right!!!
40N = 40 kg m / s^2
So no, those expressions are not equal.
that would be a force of 40N.s
which would be like a mass x its acceleration.
we were talking about a spring.
the force that the spring can supply as it expands.
thats why I used N
Force is not momentum. Velocity is not acceleration. Let's find its momentum after 2 seconds:
p=mv
p=ma*t
1000000 x .00004 x 2 = 80Ns
Let's find its momentum after 1000 seconds:
p=mv
p=ma*t
1000000 x .00004 x 1000 = 40,000Ns
kallog do you have any springs that you can apply a force to and get 2 times that force back by allowing the spring to expand in 2 seconds?
better yet I want the one that you can apply a force to and get 1000 times that force back by allowing the spring to expand in 1000 seconds?
thats awesome.
I think the problem here is that you are using a force that is constant over a period of time.
40N x 2 seconds = 80N
and
40N x 1000 seconds = 40,000N
that would be like you standing there re-compressing the spring every time it
expands .000000000000000000000000001 meters.
I am using a spring that does not deliver a constant force over a period of time.
the force that the spring delivers gets lower and lower as it expands.
so its not constant , its force gets consumed unlike what your using.
maybe we shouldnt use momentum.
because if I apply a force of 40N to a spring for 1 second
I should only be able to get 40N of force out of that spring
no matter how much time it takes for the spring to expand.
a spring is not a inexhaustable supply of force.
maybe it would be better to just ask you what word would you use to describe the amount of force that an object that isnt accelerating (but has a velocity) that collides with another object would generate?
you pick a word for us to use.
and it will represent the (
force) that a moving object
(not a accelerating object) will place on another object.
this is really getting ridiculous , I cant help it that the stupid idiots that made the physics words didnt include a word for that so lets just make one up to use.
a word that can be used to describe the following
a 10 kg mass that is traveling at a speed of 1 meter per second (not meter per second per second) should have a
(the word we choose) of 10 kg m/s
if it strikes a wall it should deliver a
(the word we choose) of 10 kg m/s to the wall.
so that you can write a sentence like below describing the
(the word we choose) that the 10 kg m/s object applied to the wall.
a mass of 10 kg struck the wall traveling at 1 meter per second and generated a (the word we choose) of 10 kg m/s
we cant use force for the word because the object isnt accelerating.
because force is mass x acceleration.
we cant use momentum because momentum isnt a force.
so what word can we use?
