Recent content by yoelhalb

What I am saying is that you wouldn't say that a momentum of mv would result in an impulse of 2mv on another object [and completely different scenario] (provided that the collision time is only an instant). To show that just consider that an impulse of 2mv on an object with intial zero...

Well I will have to settle my mind on that, after all this is probably the reality, although I still find it odd that a momentum of mv (and a collision just lasting a fraction of a second) will result in a change in momentum of 2mv (which is like saying that a momentum of mv caused an impulse of...

sorry for my incorrect notation, but it is an impulse of 2mv and a force of minimum 2mv/s, and it was caused by a momentum of 2mv. And in other words the momentum caused an impulse twice as it's own. Consider for example that the ball pushed another ball with twice the mass as the first, and...

If my understanding if the concepts is correct, then impulse is the change of momentum, while force is the change of momentum with respect to time, and since here the collision was just an instant and the impulse is 2mv then the force must be 2mv/s. My problem is that this was caused by a...

But what triggers me is the fact that the change in the balls momentum is 2mv, and according to the second law this is the amount of force applied. On the other hand the source that caused the force is the momentum of the ball (that resulted in an equal force from the wall on the ball). As...

After all you are probably right, and although before and after the collision the net force on the wall is zero, still at the time of the collision we have to add the static friction force to keep it at rest. As such the force that the ball exerts on the wall is canceled by the static friction...

Good idea, but I really doubt if this is considered an external force. Consider the proof of the conservation of momentum, it is based on that the force is the derivative of momentum, and that there equal and opposite forces, thus canceling out. But the wall force is there from the beginning...

Hi all. I am learning physics and I have the following problem. Suppose there is a ball of mass m traveling with velocity v towards a wall at rest. The ball bounces back and it's now at velocity -v. Since the wall is always at rest, it follows that the total momentum before the collision was...

Well I was also wondering about that and I can't still find the physical relationship between the two, however both are related to force (since force is the derivative of momentum and work is (force)(distance)). The complete derivation you can find in this thread...

Is this a religion?. Actually can you explain how the clocks are being affected by the light? is this action at a distance?. And what happens if it is dark and there is no light? will the clocks behave differently?.

Here is another light experiment. Consider A and B are in a linear motion next to a wall, and the wall has an hole. Now consider we are putting on a light for a second and turn it off right away, the light will shine out from the hole perpendicular to the linear motion (so we cannot say that...

Let me explain myself again. There is a known paradox called the twin paradox, and there is basically two answers on it, 1) that the subject moving must rotate in order to get back, 2) that the subject has to accelerate and decelerate when starting and ending the motion. We have to understand...

Again so two people in different timezones on Earth can claim to be younger?. Had you seen my proof?, (actually the post you are reffering to has more proof in the beginning of it). Again what I say is that it is based on the claim that the principle of relativity must be true. (Now read...

Again my story is when there is sudden change such as the wind carries along the ship in which case the slope of the velocity will always be 0 and accordingly the g-force formula gives that the g-force will be 0. (Yet I have no way of writing such velocity as a function, the only thing I would...

What I called here acceleration I mean experiencing g-force. Here nobody will encounter any g-force and both of them will claim rest, so again when they are reunited who is younger?. So you actually claim that when Einstein proposed that the universe is round then he disregarded special...