Questions tagged [relative-motion]

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Magnetic field and frame of reference

A charged particle moves with a velocity near a wire carrying an electric current,and suppose I see the particle from a frame moving with same velocity in the same direction . I will see the charge at ...
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2answers
32 views

Does a magnetic field (moving relative to the charge) act on a stationary charge? [duplicate]

Does a magnetic field moving relative to a stationary charge act on it?
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1answer
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Problem with Relative Velocity [closed]

I was solving some problems related to relative velocity in two dimensions, and I came across a set of problems focused on a 'swimmer' or a 'boat'. In these questions, the velocity of the swimmer (or ...
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2answers
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Why distance between 2 particles is independent of frame?

I was solving question in kinematics related to minimum distance between particles there they said that distance between two particles is independent of frame the distance they both measure between ...
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0answers
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Spinning observer inside a solenoid paradox?

It is well known that magnetic fields are frame dependent, with an observer travelling parallel to a moving point charge experiencing no field. Similarly for a solenoid, a stationary observer on the ...
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1answer
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Do the time taken to travel a fixed distance changes in two different inertial frame of reference in relative motion

I have calculated time taken to travel a fixed distance by the object from two different frames of refrence. One frame was moving with uniform velocity wrt other . But time taken to cover the equal ...
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1answer
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Why is heat energy dissipation in two intervals frame dependent?

The question asks for heat produced in the given specific conditions. It seems like an application of the work-energy theorem with friction doing work on the block and dissipating the heat in the ...
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2answers
43 views

Why don't hovercrafts move West relative to the Earth [duplicate]

Suppose that there is a hovercraft floating a few centimetres above the Earth's surface. As it is disconnected from the Earth, which is spinning from West to East, shouldn't it appear to move East to ...
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2answers
58 views

Upstream and downstream problem using relative velocity

On a river coast, there is a port; when a barge passed the port, a motor boat departed from the port to a village at the distance $S_1 = 15$ km downstream. It reached its destination after $t = 45$ ...
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2answers
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Who applies the force on the things moving backward that we see when moving forward? [duplicate]

When we move forward in a car, things around us move backward. I understand some force is being applied on the car that is the reason for its forward movement. But what is the source of force on the ...
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2answers
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Force equations for a particle in a non-inertial frame of reference

I am familiar with Pseudo forces and how we use them in accelerating reference frames. My question is a bit specific. Let’s say I am accelerating at $a\frac{m}{s^2}$ and holding a tennis ball of mass $...
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Magnus effect and frame of reference

We know how Magnus force shows its effects. And we know the reason for this effect. But in all the answers, frame is fixed to the moving object. ( I read in my book that the effect happens because air ...
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1answer
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Forces acting on a book on a moving table [closed]

I’m studying for an upcoming physics exam and one of the sample questions essentially boils down to this: a book (not clamped on) is on a table that is moving to the left. Is there a force of static ...
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1answer
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Reasoning pseudo force due to accelerating car mathematically [closed]

For a person inside an acceleration car, his acceleration inside the frame is $a_{\text{rev}}$ , outside the car is accelerating at $a_{\text{car}}$ and person inside is accelerating at a rate of $a_{\...
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5answers
259 views

Time dilation in a moving frame of reference

According to the theory of relativity, time slows down in a moving frame of reference. But I am confused in the example given below. Suppose there are two men $A$ and $B$. $A$ is standing in moving ...
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2answers
60 views

Why do two objects at distance of closest approach have equal velocity?

So, Here is a proof I came up for it, Define, x(t) = $x_2 - x_1$ [ relative position function x_1 is position of body and x_2 of another body] Then finding maxima of this function leads us too $...
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4answers
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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 ...
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2answers
45 views

What does an observer in a reference frame moving with velocity of light see, when another reference frame with velocity c is launched in opposite? [closed]

Suppose a reference frame is moving with velocity c in +x direction. An observer is there. At any time instance, another reference frame with velocity c is launched in opposite direction, i.e. -x ...
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2answers
51 views

Which should be the correct option? [closed]

Question-- A person standing on the floor of an elevator drops a coin. The coin reaches the floor of the elevator in time t1 if the elevator is stationary and in time t2 if it is moving uniformly. ...
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1answer
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Taylor's Classical Mechanics - Confusion About Reference Frame

I am hoping to dig a little deeper into what Taylor says on page 9 of Classical Mechanics. I've provided an excerpt just below: A more important difference arises when two frames are in relative ...
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1answer
27 views

Relative velocity during a collision

I quote Resonance Kota module on Mechanics(Vol.1): The collision is just avoided if relative velocity becomes zero just at the moment the two cars meet each other. I don't understand why should it ...
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1answer
37 views

Observing from a jumping frame of reference

Today, I was doing some exercise and started with jumping (normal jumping). The exact situation was something like this: I was standing in front of a window, at my eye level, behind it was my ...
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1answer
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Problem regarding relative velocity [closed]

Train A moves north with speed 54km/h. What is the velocity of a monkey running on roof of a train A against its motion (with velocity of 18km/h with respect to A)as observed by a man standing on ...
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1answer
28 views

Relative velocity of a particle under uniform circular motion

The question is based on fairly simple mechanics principles but seems to have no definite answer. Suppose there is a point particle A at a point X and around it another particle B in uniform circular ...
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2answers
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If you could fly, at what point would you see the Earth rotate?

If we could fly away from the Earth (imagine Superman), at what point would we notice the Earth's spin (or at what point would be stop moving along with the Earth)? Or is that just not how relativity ...
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11answers
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How can any speed be defined as a constant? [duplicate]

We know that the speed of light is a constant, and can therefore be used to calculate many other relative values, but I'm having difficulty understanding how speed can be a constant, seeing as it's ...
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2answers
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Is there a physics law according to which, in general, the smaller an object is, the faster it moves? [closed]

I have always felt, in general, that dogs run faster than humans and that birds fly faster than dogs and than bees can fly or at least drift by the wind faster than birds and that plant seeds would ...
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1answer
41 views

A non-intuitive kinematics problem? [closed]

Ann is sitting on the edge of a carousel that has a radius of $6\ \mathrm{m}$ and is rotating steadily. Bob is standing still on the ground at a point that is $12\ \mathrm{m}$ from the centre of the ...
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1answer
58 views

Does General Relativity actually satisfy the General Principle of Relativity?

The “General Principle of Relativity” being “All systems of reference are equivalent with respect to the formulation of the fundamental laws of physics”. To my knowledge, this is related historically ...
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1answer
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Momentum conservation of a rocket [closed]

I am trying to solve a relativistic rocket equation. The rocket dumbes fuel $N$ times, in the $-x$ direction, with a mass of $\varepsilon m_0$, where $m_0$ is the rest mass of the rocket. The rocket ...
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1answer
64 views

Why doesn't a fly in the moving train hit the wall? [duplicate]

Just a simple question but trickier than I expected. Let us suppose that there is a fly hovering in the moving train. The train moves at a speed much higher than the hovering of the fly. However, the ...
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2answers
58 views

Non-uniform relative motion between inertial reference frames?

I have the following doubt: let person A be in free fall being gravitationally attracted towards a massive body M. Suppose then that person B is completely isolated in space and in particular very far ...
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0answers
25 views

Vector addition of drone affected by wind

I've been struggling with this calculation for around a week and am starting to question whether or not it's even possible. What I want to do is find the bearing and speed a drone will need to fly at ...
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0answers
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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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1answer
63 views

Is there a Group that covers (classical) relative velocities?

I'm not very well versed in Abstract algebra and group theory, so this question might not make sense to begin with, but I got an idea when reading up on how to rigorously calculate relative velocities....
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2answers
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If I use the Earth as my point of reference on a model, would it be valid if I said that the Sun orbits the Earth? (in my model)

What the title says. If I create a model, and I use the Earth as my point of reference, is it valid to say that the Sun orbits the Earth inside my model? Or is claiming that invalid?
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2answers
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Relative Kinetic energy

Let velocities of two bodies $m_1$ and $m_2$ be $v_1$ and $v_2$ respectively. So can we write relative kinetic energy of $m_1$ with respect to $m_2$ = $$\frac {1}{2} m_1 (v_1-v_2)^2$$
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Is it possible to determine if you are placed perfectly stationary in outer space?

Many questions and answers that I read are saying that it's not possible to determine absolute stationary position in space. But when I think about it, it seems weird and unlikely. If you cross-...
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3answers
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Is motion really relative?

I had a question that had been bothering me for some time. I tried to come up with an explanation but I wanted to know whether it is right. Imagine two different observers say A & B floating ...
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0answers
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How to calculate the velocity of a load attached to an unwinding string? [closed]

I would like to find out how to use the variables I have already calculated to find velocity in the following problem: A weightless thread of length $68.3$ cm is attached to the end '$A$' of a ...
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3answers
161 views

Why does hot air balloon rotate with the earth?

This might be a silly question but I have been wondering this for quite a while. When a hot air balloon is flying in the sky, the earth is rotating at the speed of 1000 mph. Why does it move along ...
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0answers
39 views

Coordinate transformation from a rotating system to a stable one

To take this from the beginning, I have this exercise: A coordinate system Σ' is rotating relative to an inertial system Σ with angular velocity ω=2tx-$t^2$y+(2t+4)z. Both systems have a common ...
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1answer
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Accelerated charges and electromagnetic fields

It is known that accelerated charged particles radiate electromagnetic waves. Now let's consider $2$ boxes $A$ and $B$ accelerated with the same acceleration $\vec{a}$ and with the same variable ...
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1answer
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Why do we hold umbrellas upright while walking?

Recently I encountered this (quite interesting) question: Rain is falling vertically. A man running on the road keeps his umbrella tilted but a man standing on the street keeps his umbrella ...
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1answer
36 views

Total work done by friction on a system, when friction is static and internal to system? [duplicate]

Will the total work done by friction on a system be always zero if friction is static and internal to the system? Explain if possible by man boat problem as system and no friction is being provided by ...
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1answer
185 views

What will be the total work done by friction on the system (man+boat)? [closed]

As I am seeing this, the man and boat will have different displacement from ground frame, so there should be a net work done by friction . The books says, total work done by friction is zero when ...
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6answers
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Does Special Relativity Imply Multiple Realities?

Thank you for reading. Before you answer my question, I feel I need to let you know that I'm still a beginner in special relativity...so the more thorough the answer, the better. Thank you! Alright, ...
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3answers
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Relative velocity question, explanation needed

This is not a technically complex question but just a matter of perspective while solving. I am unable to comprehend the solution given by my teacher. The topic is relative velocity. The question is ...
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4answers
72 views

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 ...
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1answer
46 views

Why do tires move forward?

I have heard a lot of people saying that when the tires of a car rotates backward, a friction acts in forward direction on the tire and the car moves forward. Now according to my physics book, " ...

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