All Questions
22
questions
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5
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Do released objects take the direction and speed of their parent frame's velocity, or just the parent frame's speed component?
Context: I'm working on a space game. I noticed that an unpowered object fired from a strafing spaceship appeared, as the released object moved, to curve in the direction the ship was strafing. This ...
4
votes
5
answers
711
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Can't understand a statement about motion
From the book where I am studying motion, It says
Motion is a combined property of the object under study and the observer. There is no meaning of rest or motion without the viewer.
I know that, for ...
- 157
5
votes
3
answers
2k
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What is the "true" distance an object travels based on relative speeds?
There are two objects (x and y) with x travelling at 10km/h and y travelling at 11km/h, both with respect to the earth. After 1h, from the perspective of the earth, y travels 11km, but from the ...
- 59
0
votes
2
answers
133
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How do we know if a particle is moving or not? [duplicate]
if there is only one particle in the universe, how do we know if it is moving or not?
We don't have any other object to track the distance between the two, then is it possible to determine the ...
- 103
3
votes
2
answers
67
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Relative Velocity (Kinematics) [closed]
I was studying the concept of relative velocity and after solving a few problems I am running into this confusion.
a) Let’s say two cars are moving perpendicular to each other (no collision) with ...
- 31
14
votes
0
answers
679
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Motion of Points around a Triangle [closed]
I came across this problem in the book "Problems in General Physics by IE Irodov"-
Three points are located at the vertices of an equilateral triangle whose side equals s. They all start ...
- 149
0
votes
4
answers
239
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Motion and the Universe
In physics class today, I learned that motion is relative, and to determine if an object is moving or not, you need to have a stationary reference point.
Well, that got me thinking:
How can you ...
0
votes
3
answers
62
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From the frame of reference of a colliding object, does the entire universe change direction when it bounces?
Consider three objects: a rubber ball, a spaceship, and an isolated brick wall floating serenely in the vacuum of space.
From the perspective of an observer on the spaceship, the ball is moving ...
- 103
44
votes
12
answers
10k
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Is there any physical evidence for motion?
Let's say that we have 2 tennis balls in space, one being in motion (say, pushed by an astronaut), and the other one still.
If we could take a snapshot of both tennis balls, would there be any ...
- 591
0
votes
1
answer
73
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Free fall time after being accelerated [closed]
An elevator car whose floor-to-ceiling distance is equal to $2.7m$ starts ascending with constant acceleration $1.2 m/s^2$; $2.0 s$ after the start a bolt begins falling from the ceiling of the car. ...
- 558
1
vote
3
answers
191
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If there was but one object in the universe, can it be accelerating or not accelerating?
If there is only a single (material) object in the universe does it still make sense to speak of it as accelerating or not accelerating?
I believe it might be an equivalent question to ask whether it ...
user220934
0
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4
answers
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If you are sitting completely still inside of a moving car are you at rest?
My teacher and I had an argument in class where I stated that motion is undefined without a reference point and that you could just as easily claim that the road is moving backwards at the opposite ...
- 1
1
vote
1
answer
2k
views
What makes an object to be at rest?
We understand both motion and rest are relative. But me and my friends always discussing about this kind of thought experiment involving a single object (for example, a particle with mass or massless ...
- 364
1
vote
6
answers
379
views
How can a particle which is not moving have an acceleration?
Suppose a rod is rotating around a fixed point located at an extreme point of it and there are two points on it. One, somewhere in the middle and the other at the other extreme.Call them $A$ and $B$ ...
- 1,770
-1
votes
1
answer
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What happens if you fly a drone inside moving passenger airplane? [duplicate]
I have a little question. If I mark an X in the center of a passenger airplane, and try to fly a drone from the X mark in the moving passenger airplane (800-900 km/h), what will happen to the drone?
...
