All Questions
Tagged with relative-motion acceleration
28
questions
3
votes
2
answers
279
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Can we use relative motion if acceleration of two bodies are different?
Suppose, on the $x$-axis, a body $A$ is moving with velocity $v_1$ and acceleration $a_1$, and a second body $B$ is moving with velocity $v_2$ and acceleration $a_2$. $B$ is at a distance of $S$ from $...
CommunityBot
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11
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3
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How can you accelerate without moving?
I know this question has been asked in other forms, generally regarding the balance of forces. This time I want to focus on motion. I've got a laser accelerometer on my desk. It tells me that I'm ...
- 109
16
votes
7
answers
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Is acceleration relative?
A while back in my Dynamics & Relativity lectures my lecturer mentioned that an object need not be accelerating relative to anything - he said it makes sense for an object to just be accelerating. ...
- 141
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2
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74
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Accelerating body in a non-inertial frame of reference
If a body is subjected to a force, can I find a non-inertial frame of reference in which the body is not accelerating?
- 1,387
2
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1
answer
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Flying mosquito problem [duplicate]
Let's say there is a car and its doors and windows are closed. Basically it is a closed space inside. There is a mosquito hovering right in the center of closed space of the car. While doing so the ...
- 5,078
2
votes
3
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553
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If I accelerate through space, can I say all stars gain kinetic energy?
Suppose I accelerate through empty space. Say all stars are small heavy marbles I can use to do work with by means of their velocity. Say I can let them smash into some generator that turns their ...
- 26.4k
13
votes
11
answers
3k
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What is the essential difference between constant speed and acceleration?
I do know what the difference is but what I am trying to understand is how an object knows its speed is changing and/or how space knows an object is accelerating. The particular thing I am interested ...
- 2,238
0
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1
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For an airplane moving north from some latitude (say $30^{\circ}N$), why does rotation of the Earth cause an increase in apparent drag?
I'm not able to understand the answer to this example:
Example 10 from the Curtis Orbital Mechanics text book :
An airplane of mass $70 000\ \mathrm{ kg}$ is traveling due north at latitude $30^\circ$...
- 207k
7
votes
1
answer
2k
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What is my acceleration in my own frame?
This is , I suppose not a good question , but I think I am missing something which confuses me in this question.
So my question is:
Velocity is relative. So suppose a car is moving at a speed $200 \;\...
- 12.1k
0
votes
2
answers
91
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Why does these two masses not have same acceleration? [closed]
Assumptions: No friction , $m_2$=5kg and $z_1$=2kg. $z_2$ is fixed at its place.
Here, there is a mass of $5kg$ on a movable wedge of mass $2kg$. So, my question is that can we say that acceleration ...
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1
vote
1
answer
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Acceleration and geodesics in General Relativity
Consider this situation:
A) An aeroplane travels a distance from point A to point B which are located on the opposite sides of the Earth. The aeroplane has taken the shortest possible distance to ...
- 410
1
vote
0
answers
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Why does the equation for transformation of relative acceleration from one non-inertial system to another involve absolute angular velocities?
It seems that the equation for transforming between two different expressions of the relative acceleration of a vector involves absolute angular velocities, which I find surprising.
Consider two non-...
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3
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419
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If Earth accelerates, what reference frame is its acceleration relative to?
It should be a very fundamental thing, a very simple question. But there's something I want to understand.
We know that when we throw an apple vertically upwards, it experiences a force of gravity ...
- 21.4k
0
votes
1
answer
69
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Unreachable relavistic particle in accelarated motion
Let's say I have a particle in a uniformly acclerated motion such that
$$
a_\mu a^\mu = -g^2, \quad g > 0\ {\rm and\ constant} \tag1
$$
I want to prove that any signal coming from a apace-time ...
- 1,597
0
votes
1
answer
197
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Deriving the equality between the external torque and the rate of change of angular momentum, for a system of particles
I've started working through Analytical Mechanics for Relativity and Quantum Mechanics by Oliver Johns and I'm stuck on deriving a formula.
In the section titled "Change of Angular Momentum", Johns ...
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