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Questions tagged [relative-motion]

The tag has no usage guidance.

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Finding direction of a swimmer [on hold]

A swimmer wishes to swim with a speed $1 \; \mathrm{m/s}$ across a river to a point directly opposite him. The river has a uniform current with speed $0.5 \; \mathrm{m/s}$. Find the direction in which ...
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2answers
64 views

Question on relative velocity [on hold]

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
48 views

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
73 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
25 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
20 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
50 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
25 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
106 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
79 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
71 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
66 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
51 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
155 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
42 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
59 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
52 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 ...
2
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1answer
58 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
51 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
60 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
2k views

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
144 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
51 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
103 views

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
49 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
289 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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0answers
197 views

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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2answers
185 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 ...
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2answers
56 views

Inertial force in a bus [duplicate]

While i am standing in a bus that is accelerating an inertial force is acting on me in the direction opposite of acceleration (I understand that). But, what is the magnitude of that force.I thought it ...
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2answers
62 views

How can I visualize the center of mass (center of momentum) frame?

I know that the CM frame is the frame in which the total momentum of the system adds up to zero. For example, if I imagine two bodies m1 and m2, with m1 = m2, one moving at the speed v1 = v and the ...
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1answer
69 views

Physics of the tablecloth trick- why top objects tip over

In the tablecloth trick where the cloth is pulled off, with dishes etc. on top of it, I was wondering why is it that tall objects tend to tip forward? Let's say that we are pulling the cloth to the ...
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1answer
56 views

relative velocities

If two objects are moving relative to the horizontal and you have the real angle between the horizontal and the direction of travel of one object, how does this real angle differ from the angle ...
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0answers
48 views

Concern about Spacetime Invariance [duplicate]

The space-time invariance principle states that: $(c^2)(\Delta t^2) - l^2 = \rm invariant$ for any inertial frame. Consider two events that occur at the same time in inertial frame $S$, and frame $...
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1answer
51 views

Can the Doppler effect account for the increase in an object's energy with velocity?

I am aware that the relativistic mass can be expressed in terms of rest mass and momentum, which seems to be the canonical explanation, but I am looking at an alternative way of visualising the ...
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2answers
102 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 ...
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3answers
138 views

Special Relativity - Why does time dilation cause length contraction? [duplicate]

As an object moves faster, its time runs slower by factor X. I get why this is the case, but I'm not sure why distance is decreased by factor X as well. Questions: 1) Why does a moving object's ...
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1answer
5k views

Why is Voyager 1 approaching Earth? [duplicate]

When I read JPL's mission status for Voyager 1 and Voyager 2 the distance between Earth and Voyager 1 is decreasing. Is it right?
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3answers
103 views

Inside a box moving with constant velocity

Suppose You were put into a box with all the instruments you might require. The box moves with constant velocity on the surface of the earth. We are asked to detect inside the box whether we are ...
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2answers
129 views

Can sound be faster than 300m/s?

If you sit in a car and it's driving $300{m \over s}$ and you clap your hands for a very very short sound, will it's wave be $600{m \over s}$ fast, because it adds the speed of the car? Or will it be ...
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3answers
116 views

Relative motion + electromagnetism

We say that Force exerted by a current carrying wire on charge $ q $ moving with velocity $v$ is: $F=qvB\tag*{}$ (Where $B$ is the magnetic field , and electric Force is 0 because wire is neutral.) ...
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2answers
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Is it possible at half speed of light to explore in space or walk with suits like astronaut do? ( Passengers Movie )

In the film Passenger the spaceship was flying at half light speed so I was thinking was it even possible that like chris pratt one can go out of such fast moving ship with just the rope tied not ...
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3answers
126 views

Is probability relative?

Suppose you are as massive as earth and you are tumbling down space at a very high speed. You flip a coin. There is a probability function associated with the coin in motion. When it falls back in ...
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0answers
93 views

Relativity of simultaneity - under what conditions would two events happen simultaneously for frames $S$ and $S'$ when $S'$ is moving relative to $S$?

I feel like I have a fundamental confusion with the following exercise: I'm confident with my answer in (a), which is that $B$ must be within the light cone of $A$, or that $B$ is causally connected ...
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1answer
176 views

How to calculate angle between two objects going at relative velocity [closed]

I am having trouble with a relative velocity exercise. If any of you could bring some light on it i would be very happy. The exercise as it is on the book: The relative velocity of a butterfly and ...
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2answers
85 views

Relativity of velocity while riding a bike

I was trying to think of a situation in which an observer would be able to determine whether he is moving or not. Since velocity is a relative quantity I was unable to do so. However, consider a ...
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2answers
69 views

Direction of velocity

I found this question and I have a problem: Two friends A and B are standing a distance $x$ apart in an open field and wind is blowing from A to B. A beats a drum and B hears the sound $t1$ time ...
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1answer
31 views

Revolution of the Earth [duplicate]

Good day, it seems easy but I still find it difficult to understand why we return to the same spot when we jump despite the Earth revolving beneath us. Can someone explain?