All Questions
Tagged with relative-motion kinematics
15
questions
8
votes
5
answers
27k
views
Speed of a fly inside a car [duplicate]
A couple of weeks ago I was travelling in a car (120 km/h approximately) and I saw a fly flying in front of me (inside the car, near my nose, windows closed). I wonder how was that possible.
Does it ...
- 225
31
votes
7
answers
23k
views
How can kinetic energy be proportional to the square of velocity, when velocity is relative?
Let's start with kinetic energy (from los Wikipedias)
The kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a ...
- 411
1
vote
2
answers
8k
views
What will be the relative speed of the fly? [duplicate]
It has happened many times and i have ignored it everytime.
Yesterday it happened again .
I was travelling in a train and saw a fly (insect) flying near my seat.
Train was running at a speed of ...
- 113
3
votes
1
answer
992
views
Relative Speed vs speed of light [duplicate]
Possible Duplicate:
Travelling faster than the speed of light
Someting almost faster than light traveling on something else almost faster than light
I've got two questions which are related and ...
- 203
2
votes
0
answers
313
views
Dog running after shepherd [closed]
Assume there is a dog A on a field and a sephard B. B moves on straight line with constant $...
- 137
44
votes
12
answers
10k
views
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
2
votes
3
answers
9k
views
Galileo's law of odd numbers
The Galileo’s law of odd numbers states that the distances traveled are proportional to the squares of the elapsed times. In other words, in equal successive periods of time, the distances traveled by ...
- 179
7
votes
3
answers
24k
views
Ball thrown from a moving train
This is not a question about throwing a ball vertically in a moving train. I am asking what would happen if I throw a ball in a horizontally in a moving train. Assume I am facing an exit door of a ...
- 2,479
3
votes
1
answer
3k
views
Trajectory of a swimmer trying to reach the opposite bank [closed]
I came across the following question 2 days ago:
$Q$. A swimmer is swimming in a river with a speed $u$ with respect to the speed of water which is $v$. It is assumed that the river has straight ...
- 195
1
vote
1
answer
3k
views
Finding resultant and direction of resultant
In this question-
A motorboat is racing towards the north at 25km/h and the water current in that region is 10km/hr in the direction of 60 degrees east of the south. Find the resultant velocity of ...
- 715
1
vote
3
answers
6k
views
Relative motion involving angle
Suppose I am going in a direction with a velocity $v_1$ and my friend is going in a direction which makes an angle of $A$ with my direction with a velocity of $v_2$.
Then what will be my relative ...
- 1,400
1
vote
4
answers
138
views
Motion between two particles in a relative manner
Suppose a particle A is travelling in east direction with velocity of x m/s and another particle B is travelling with velocity y m/s in the west direction. Why does the the particle B appears to move ...
1
vote
4
answers
5k
views
Does an airplane's speed include the speed of the Earth?
After take off, does airplane's speed include Earth's movement/speed? Do airplanes turn with Earth movement/rotation?
- 11
0
votes
2
answers
4k
views
Why do objects seem to move faster (relatively) when they move tangential to the observer?
I've observed this loads of times while travelling, in cars, trains,etc.I can't quite put it in words and therefore I've roughly made a diagram to assist my question.
Assume an observer is travelling ...
- 7,319
0
votes
1
answer
88
views
Kinetic energy in different frames [duplicate]
I have an electric bike moved by a battery. I am at a train station with two friends. A flat train car platform passes by at $1 m/s$. The friend #1 jumps on it while the friend #2 remains at the ...
- 12.7k