# Questions tagged [relative-motion]

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### special relativity - relative motion of two objects [closed]

I'm stuck in this exercise. I don't know how to proceed. Any hints I appreciate it. Two bars of the same proper length $L$ moves in the same way on the $x$-axis. In the reference frame of one of the ...
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### Swing in moving truck

I was just thinking about a situation in which a big truck is moving in high speed say ( $80 \ miles/hr$). There is a swing attached with the ceiling of the truck container which can move freely in ...
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### Pursuit curve on a sphere [closed]

One day I thought about chasing curve on a sphere. I wanted to find parametric equations such as $\theta (t)$ and $\phi (t)$ of running dog always towards a rushing cat on a big spherical world. ...
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### What's the name of the hypothesis that states that instead of the universe expanding, all matter is shrinking? [closed]

I recall a few years ago there was such a hypothesis I read about. No longer do I remember the name though. Can anyone help me out?
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### Calculating unknown Relative Velocity from Given 2 Known Relative Velocities for speeds comparable to speed of Light

Dear fellow physics lovers, Given 3 objects A, B and C, travelling with relative velocities such that $\vec{v_{AB}}$ = Velocity of Object A with respect to Object B $\vec{v_{BC}}$ = Velocity of Object ...
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### Kinematics in moving reference frames

Assume we have an object moving along a path $p_W(t)$ that is described in some fixed reference frame $W$. If we now have a second reference frame $B$ which differs from $W$ by some time varying ...
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### Why the relative motion goes wrong here?

This is a question from jee advanced. I followed the approach of relative velocity In the frame of rocket we can write $s_{rel}$=$u_{rel}t$ since acceleration of both the particles is 0 in this frame ...
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### Doesn't this experiment signify that inertial frames are not equivalent? [duplicate]

While reading about kinetic energy something poked in my mind. When we talk about kinetic energy of a body, it is actually the combined kinetic energies of all the atoms in that body. Now suppose a ...
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### Relative Motion in Two Dimensions

There's a problem that I've been working on in physics for a couple of days now, and I'm just wondering if my thinking is wrong here. Say you're given the velocity of an object (with an x- and y-...
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### Relativistic or non relativiistic mechanics?

Question: A train of length $l=350 metres$ starts moving rectilinearly with the constant acceleration $a=3×10^-² ms^-²$; $t=30s$ after the start the locomotive headlight is switched on $(event 1)$, ...
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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 ...
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### Velocity Question from grandparent

My Grandparent asked me this question a few years ago, and I am getting around to giving him an answer, but I don't know the answer. Can anyone help? "A pickup truck is speeding along a highway ...
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### Relative motions, between inertial and non-inertial frames or bodies

I had no other way to put my problem to you guys thus I am taking an example.... Here, ...
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### Coriolis effect vs preservation of angular momentum on merry-go-round, sniper's bullet, hovering helicopter and high altitude rockets

I understand that how helicopter hovers at the same position or a thrown ball falls to the same position even though earth is spinning. This is due to the preservation of angular momentum and my ...
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### Why motion is not absolute or relative to space?

We say that motion isn't absolute.but why?if we measure motion relative to "space" it will be absolute for all observers. isn't it? Is space also relative like motion? If space has no "...
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### Is the frame of elevator Preferred over the frame of ground? [closed]

When an object is thrown upward with some velocity then it doesn't fall towards the earth until the given velocity becomes zero. Now imagine the case given in the figure There is a question in my ...
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### How to decide which velocity is bigger in a collision before writing velocity of approach and velocity of separation?

My teacher said that velocity of separation is $V_1$- $V_2$ where $V_1$ is greater than $V_2$ and said same for velocity of approach. The problem is how would you determine which velocity is greater ...
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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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### 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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### 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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### 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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### 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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### 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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### 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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### 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 ...