All Questions
Tagged with relative-motion momentum
11
questions
2
votes
1
answer
47
views
Why is relative velocity taken with respect to final velocity of affected object?
I am practicing a conservation of momentum question:
Two identical buggies move one after the other due to inertia (without friction) with the same velocity $v_0$. A man of mass m rides the rear ...
- 73
-2
votes
5
answers
251
views
How do emitted photons in a moving light clock keep moving sideways with the clock when photons have no mass and therefore no inertia? [closed]
I have yet to read or hear a plausible explanation for how vertically emitted light waves/photons, coherent ones like from a laser, are able to keep moving horizontally with a moving light clock so ...
2
votes
0
answers
55
views
Should the velocity increase or decrease?
Suppose some projectile is traveling along the positive $x$ direction at a velocity $v$. While moving it is emitting particles, and thus losing mass. If the particles are being emitted in the same ...
- 1,791
0
votes
0
answers
76
views
Doubt regarding derivation of rocket equation
I'm having quite some issues deriving the ideal rocket equation, and I suspect it is due to lack of identifying scalar terms and vector terms. Here is how I derive it :
Let $v$ be the velocity of the ...
- 1,791
1
vote
1
answer
105
views
A question on time taken in different frames of references
Let us say , a swimmer has to swim upstream and downstream a river , between two points which are at distance "L" from each other . The swimmer can swim in still-water at velocity "Vs&...
- 123
0
votes
3
answers
112
views
What really pushes a rocket up?
To launch a rocket, fuel is burnt and is released in opposite direction relative to rocket and it pushes the rocket upwards because of third law of motion but the fuel molecules are not actually ...
- 171
2
votes
4
answers
1k
views
Co-efficient of restitution
Co-efficient of restitution is defined as
$\displaystyle\frac {Relative \ velocity \ after\ collision}{Relative \ velocity\ before\ collision}$
so lets consider two bodies A and B moving with ...
- 296
1
vote
1
answer
982
views
How does friction cause a boat to move backward if a person on it moves forward?
If a person on boat moves forward (from left to right of a boat)and if we draw the free body diagram we would observe that
1)mg is balanced by normal reaction
2)friction acts to the left side, on the ...
- 47
0
votes
2
answers
338
views
How can I visualize the center of mass (center of momentum) frame?
I know that the CM frame is the frame in which the total momentum of the system adds up to zero.
For example, if I imagine two bodies m1 and m2, with m1 = m2, one moving at the speed v1 = v and the ...
- 11
4
votes
0
answers
32k
views
Portal 2 physics - one moving portal [closed]
A problem is posted and solved so many times on 9gag - till yet no good answer.
The problem: you have two portals (one moving and one still standing). The one moving reach a still standing cube: what ...
3
votes
2
answers
1k
views
Origin of motion and relative speed of bodies in the universe
Charged particles can hit the earth at relativistic speeds. But it
seems that all large bodies have fairly low relative speed. Of course,
speed can increase considerably when a body orbits close to a ...
- 3,798