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Questions tagged [relative-motion]

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Cartesian basis vectors in polar coordinates

I'm trying to solve a problem which includes a spinning object and I want to find it's velocity vector with respect to an object moving in a straight line on the the x axis with constant velocity. I ...
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2answers
48 views

Is one side of earth faster at night and slower at daytime?

I'm reading Physics for Entertainment by Yakov Perelman and in it he says under "When we move around the sun faster" that at midnight the speed of the rotation of the earth is added to that of earth's ...
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River-Boat problem [on hold]

A motorboat going downstream overcame a raft at a point A ; t=60 min later it turned back and after sometime passed the raft at a distance l=6 km from the point A. find the flow velocity assuming the ...
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River crossing with pointing method [on hold]

A river is $b$ meter wide and the water is flowing with $u$ velocity. A man with $v$ velocity respective to the river water want to get to the straight other edge point (means that point is just front ...
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Are there local coordinates for Schwarzchild spacetime?

In the Schwarzchild metric, $t$ is the time on the clock of an observer at infinity, and $r$ is the related to the area of a sphere by $A=4\pi r^2$. Are there more physical coordinates one could use, ...
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3answers
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Speed vs Velocity of light in Light clock thought experiment

A related question has been asked multiple times (like here, here and here). But none of those answers are clearing my doubt. In fact they're furthering my confusion. My specific doubt is regarding ...
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2answers
39 views

Aerodynamics of cycling into a tail wind

I was looking at Steve Gribble's Cycling Calculator , and I noticed that the aero resistance was higher going 40 mph with a 20 mph tail wind than going 20 mph with no tail wind. Why is this? I always ...
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1answer
48 views

Dark matter relative velocity

In Dark Matter Indirect Detection literature, it is usually said that the relative velocity of dark matter particles in the galactic halo is about $$ v \sim 10^{-3}c$$ See for an example this lecture ...
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2answers
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Can two electron moving in opposite direction move faster than light? [duplicate]

Suppose we are moving two electrons in opposite direction both having a speed of 1.6e8 meter per sec.When they will cross each other then their relative velocity will be 3.2e8 ms_1.Isn't it faster ...
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3answers
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Friction and Work in Inertial Reference Frames [duplicate]

Say a train is moving in the positive $x$-direction at 100 meters per second with respect to the ground frame. Now let's say someone is pushing a large box in one of the cars of that train in the ...
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1answer
34 views

How does Kinetic Energy transform from one frame of reference to another?

Let's say I observe a charge q floating in the middle of space. I set up another charge Q a distance d away from charge q was causes a force F to act on charge q. As charge q moves away from charge ...
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5answers
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Inertial and non-inertial frame

How to define an inertial frame of reference mathematically? I want a definition with proper chosen coordinate axis which will help me to differentiate it with the non inertial ones. I have been ...
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Relationship between doppler effect and redshift

Let us define the redshift z as and we know that the Doppler effect relationship is: where c is the velocity of waves in the medium; Vr is the velocity of the receiver relative to the medium; ...
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1answer
26 views

Differentiating linear and non-linear motion

If there is a Person sitting in a vehicle which is moving, how could he find out whether it's in motion and if he figures that out, how does he find out whether it's accelerated or non-accelerated?
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1answer
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Super luminal speed paradox? [duplicate]

Chosing a reference frame in which the Earth is at rest and doesn't rotate is related, but different. Here I'm asking if there is a paradox and if my attempt at resolution has merit, and if not ...
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1answer
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Why dont we account the rotation of the earth in aircrafts? Is it just because of the air or is there more to it? [duplicate]

Today there was a seminar regarding modern air crafts held in my school. At the starting of the lecture, we were asked a question which I found quite intriguing. "Why does a helicopter or a fixed ...
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1answer
47 views

Is this Question correct? Newtonian Motion - Relative Motion of Rain

There is a question in a textbook which states: "A cyclist is riding north at 12km/h when it starts to rain. The rain appears to be falling towards her at an angle of 10 degrees relative to the ...
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0answers
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Finding width of a river, speed of its current, shortest time needed to cross it, and how far along the bank one would travel

While I'm confident my answer for part (b) is correct, it depends entirely on the answer to part (a), which took me long enough to work through to warrant a sanity check. For reference, $\vec v_{A/B}$ ...
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4answers
3k views

What's the speed of light when viewed from the side?

Suppose a pulse of light is sent from $A$ to $B$ in a rigid triangle $ABC$. While the pulse is moving from $A$ to $B$, what is it's velocity relative to $C$? The special character of the photon among ...
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1answer
36 views

How would one compute the path of an particle's motion from forces defined in different frames of reference?

I'm trying to write a computer program to render and play-back the path of a particle existing in 2D space given all forces acting on said particle. This is relatively easy to do if all forces are ...
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2answers
90 views

Question on relative velocity [closed]

If a man is moving on a horizontal belt (with constant velocity w.r.t belt)which is also moving in the same direction with some velocity , then time w.r.t belt and w.r.t ground to travel some ...
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0answers
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Correlation between velocity and homogeneity of spacetime and isotropy of space

Considering only inertial frames of reference and constant velocities, does the fact that any velocity, with the exception for the speed of light in a vacuum, can be transformed, via an accurate ...
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2answers
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Doubt on how I have applied Newton's law of motion

I have found several questions where the pseudo force is applied in the wrong direction, and I am confused whether I m correct or not. The question is something like this. Thin threads are tightly ...
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1answer
75 views

For a lay person, what if there was no atmosphere? [closed]

What if there was no atmosphere (or little like on the moon)? Could I then hover above and watch the Earth below turn? Originally I queried, "why couldn't a person just float up in a balloon, hover ...
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1answer
26 views

Rotationated inertial frames and Galileo Relativity

Consider then a inertial frame $S$ and another one, $S'$. The inertial frame $S'$ is at uniform motion with respect to $S$. Both inertial frames are the Euclidian vector spaces $\mathbb{E}^3$ equipped ...
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1answer
23 views

Rolling resistance in relation to diameter [closed]

I am trying to determine the effects the radius of a wheel has on its ability to move across soft ground materials and have found the formula. Would this formula suggest that rolling resistance is ...
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1answer
53 views

What are the effects of diameter and width on a wheels ability to move on soft surfaces?

Often larger tires with a greater thickness are used for moving across soft surfaces such as sand. In relation to the diameter and width of tires, how do these properties provide better movability on ...
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1answer
26 views

Zero longitudinal momentum in Special Relativity

A particle is moving with an arbitrary momentum $p$ in K-reference frame. According to Jackson, "there is a unique Lorentz transformation in the $z$-direction to a frame K' where the particle has no $...
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3answers
108 views

Which one is moving? [duplicate]

If there are two objects moving relative to each other at a constant velocity, is there any experiment the bodies themselves can do to determine which one is moving? EDIT: The comments say "NO". So ...
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1answer
83 views

Can we really not tell if we are moving?

It has been a while since I've thought about physics, however, I remember something about how if you are on a train with no windows that is going perfectly straight and is perfectly smooth, there is ...
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3answers
79 views

Relative velocity equation

In rectilinear motion, to find the relative velocity of a car with respect to a train, we subtract velocity of the train from that of the car. We use this method when the car is moving on the road. ...
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1answer
113 views

Classical mechanics problem - relative velocity

I'm having a hard time solving this problem concerning relative motion: A hare runs with a constant speed $u$ on a straight line. A dog chases the hare by always running straight to it with speed $...
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2answers
54 views

Total energy of an object in motion in free space

In order to impart motion (additional motion) to an object in free space, inertia "soaks up" an given amount of energy prior to additional movement, which is related to its mass, irrespective of any ...
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4answers
158 views

Relative motion and time

When someone reaches to a speed which is close to the speed of light with respect to earth, will he see the things actually moving faster than when he is in low speeds?
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1answer
43 views

Addition of velocities

Let's say a car ,in straight line motion ,has a speed of V m/s (in the absence of wind) and let the speed of wind be W m/s the in the same direction . What is the speed of the car in the presence of ...
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4answers
85 views

Effect of tailwind on aircraft speed

I have been spending some time in analyzing the impact of tailwind on the ground speed of the aircraft. My analysis is based around the following equation : VAW = VAG - VWG ; where VAW is the velocity ...
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2answers
60 views

Explain the relative motion between two particles of a rotating rigid body

A rigid body is defined as a collection of particles in which distance between each pair of particles remains constant. I was taught that the motion of any one particle of the rigid body with respect ...
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1answer
70 views

Bullet from circular motion [closed]

I'm thinking of a problem that I can't verify at this moment, so I'd need your help. There's a person (Carl) on a circular platform, at a distance R from the center, the platform is moving with ...
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1answer
65 views

How does friction cause a boat to move backward if a person on it moves forward?

If a person on boat moves forward (from left to right of a boat)and if we draw the free body diagram we would observe that 1)mg is balanced by normal reaction 2)friction acts to the left side, on the ...
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0answers
67 views

Scalar versus invariant in Newtonian mechanics

I looking up coriolis transport theorem for rotating refrence frames and while reading through this derivation he wrote: In Newtonian mechanics, scalar quantities must be invariant for any given ...
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5answers
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Can we use redshift measurements to determine absolute velocity?

Here's a thought experiment: suppose I'm in a large box in space without windows or sensors, and I fire a laser in 6 different directions and measure the redshift along each direction. Could that data ...
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1answer
147 views

Find velocity using integration method or relative velocity approach [closed]

In the diagram shown below, jeep moves with a speed of 60kmph and the car's velocity as observed from the moving jeep is 20kmph. we need to find the velocity of the car. I used relative velocity ...
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1answer
22 views

Relative motion, is there any “safe” way to find out initial conditions for a point particle?

I'm trying to solve exercises about relative motion and having hard times in finding out the initial conditions in respect to the inertial and non-intertial frame of reference, while I'm able to do ...
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1answer
52 views

Earth's movement around the Sun

My question is - because of sun's movement around the milky way, Earth never reaches at the same point where it started from. Then how can we say that it circles around the sun in 365 1/4th days.
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3answers
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Ship' smoke velocity?

I am studying mechanics from MIT 2.003. In HW problem "which I solved wrong" they stated that: An important fact is that the smoke travels with the wind at the velocity of the wind In this problem ...
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1answer
25 views

Motion (Newtonian Mechanics)

When a net force is applied to an object and the object starts to accelerate, will its motion with this acceleration continue endlessly?( no other forces opposing this motion) If not, why?
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1answer
50 views

Inertia over an airplane [duplicate]

When an airplane is traveling, it moves at the same speed as the earth does due to inertia, but since, the plane is not directly touching the globe, how does is the speed of the earth is associated ...
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4answers
610 views

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 ...
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Question based on relative motion in two dimension

I came across this problem in my work book. A hunter is riding on an elephant of height $4$ $ m$ moving in straight line with uniform speed of $2$ $ m/s$. A deer running with a speed $V$ at a ...
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3answers
278 views

Relative Angular Velocity

Two particles describe the same circle of radius 'a' in the same direction with same speed 'v'. What is their relative angular velocity? Angular velocity of both the particles is v/a. It's direction ...