All Questions
8 questions
-4
votes
3
answers
92
views
How do you prove the formula for momentum? [closed]
I am just an absolute beginner to physics. I've seen a proof of the formula for momentum using Newton's second law of motion, but to prove Newton's second law of motion you have to use the formula for ...
2
votes
3
answers
436
views
Can something have momentum but not velocity?
The idea of momentum is fundamental, even more fundamental than velocity or mass. But I was wondering can momentum exist without velocity, since momentum can exist without needing mass?
Thinking ...
- 1,376
1
vote
3
answers
3k
views
How to prove the relativistic momentum? [duplicate]
As far as I know, the relativistic momentum of a particle is given by the equation: $$p=\frac{m_0v}{\sqrt{1-\frac{v^2}{c^2}}}$$
where $m_0$ is the mass of the particle and $v$ is the velocity of the ...
- 11
1
vote
0
answers
195
views
How should I think about a block-and-tackle configuration weight-lifting machine?
At my gym, some of the weight machines provide a double mechanical advantage using a gun tackle pulley configuration.
For a long time when I was using such machines, I convinced myself that if I were ...
- 339
1
vote
2
answers
70
views
Collision of bullets with dish to hold it in space.
A dish of mass $10\ g$ is kept floating horizontally in the air by firing bullets, each of mass $5\ g$, with the same velocity, at the rate of $10$ bullets per second and the bullets rebound with the ...
- 299
0
votes
2
answers
1k
views
A question regarding 3 bodies connected as a system
Let us consider three bodies of equal mass connected to each other with 2 ideal strings of length l. The three bodies are placed in a straight line
In this arrangement there is 1 body connected to 2 ...
- 162
1
vote
2
answers
2k
views
Conservation of linear momentum magnitude along a trajectory
I was once criticized for "taking angular momentum as momentum going
in a circle". I was loosely trying to state, in classical mechanics,
that in using conservation of momentum, one can switch between ...
- 3,808
30
votes
4
answers
73k
views
Difference between momentum and kinetic energy
From a mathematical point of view it seems to be clear what's the difference between momentum and $mv$ and kinetic energy $\frac{1}{2} m v^2$. Now my problem is the following: Suppose you want to ...
- 1,191