- #1
Kenan
- 31
- 0
I'm new to the forums and unfortunately I have a pretty dumb question...
So in isolated system internal forces cancel each other out every single time,like pushing on a door of your car does not create any motion of your car at all.
You basically can't pull yourself up by the bootstraps.
I also know that momentum which is mass*velocity is conserves in an isolated system so if there is no velocity,there is no momentum,there is no conservation.
But here is the question:
Why does the rocket move,gun recoils if forces in such systems (as you know they are isolated,at least it says so) cancel each other out,are not they isolated JUST like the car-door system,hair-human system?
I know that there is conservation of momentum,but are not forces supposed to make the body stay still,be in equilibrium?
Or maybe forces do not prevent the momentum from appearing because of 1 Newton's law where it clearly states that the body can move without acceleration even though forces on it cancel each other out?
It's just this is the main explanation for such problems such as Münchausen,pushing boat while being inside of it,pushing door of your car while being inside of it - forces cancel each other out but forces cancel each other out in rocket/gun system but they DO move!
So basically there is no other way to explain the reason of body's movement in an isolated system but saying that in this example there is no momentum and in that example there is momentum?
I'm really puzzled...
So in isolated system internal forces cancel each other out every single time,like pushing on a door of your car does not create any motion of your car at all.
You basically can't pull yourself up by the bootstraps.
I also know that momentum which is mass*velocity is conserves in an isolated system so if there is no velocity,there is no momentum,there is no conservation.
But here is the question:
Why does the rocket move,gun recoils if forces in such systems (as you know they are isolated,at least it says so) cancel each other out,are not they isolated JUST like the car-door system,hair-human system?
I know that there is conservation of momentum,but are not forces supposed to make the body stay still,be in equilibrium?
Or maybe forces do not prevent the momentum from appearing because of 1 Newton's law where it clearly states that the body can move without acceleration even though forces on it cancel each other out?
It's just this is the main explanation for such problems such as Münchausen,pushing boat while being inside of it,pushing door of your car while being inside of it - forces cancel each other out but forces cancel each other out in rocket/gun system but they DO move!
So basically there is no other way to explain the reason of body's movement in an isolated system but saying that in this example there is no momentum and in that example there is momentum?
I'm really puzzled...