Questions tagged [relative-motion]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
3answers
112 views

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 ...
1
vote
2answers
45 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 ...
2
votes
1answer
65 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 ...
-1
votes
2answers
49 views

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 ...
1
vote
3answers
91 views

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 ...
1
vote
1answer
45 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 ...
1
vote
5answers
135 views

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 ...
0
votes
1answer
47 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?
-2
votes
1answer
76 views

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 ...
0
votes
1answer
90 views

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 ...
0
votes
1answer
146 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 ...
7
votes
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 ...
0
votes
1answer
43 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 ...
0
votes
2answers
169 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 ...
1
vote
0answers
32 views

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 ...
0
votes
2answers
67 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 ...
-3
votes
1answer
95 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 ...
0
votes
1answer
36 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 ...
0
votes
1answer
28 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 ...
-1
votes
1answer
63 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 ...
1
vote
1answer
43 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 $...
2
votes
3answers
119 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 ...
0
votes
1answer
90 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 ...
-1
votes
3answers
122 views

Relative velocity equation [on hold]

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. ...
2
votes
1answer
174 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 $...
0
votes
2answers
61 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 ...
1
vote
4answers
164 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?
0
votes
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 ...
0
votes
4answers
171 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 ...
-1
votes
2answers
122 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
votes
1answer
87 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 ...
0
votes
1answer
111 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 ...
1
vote
0answers
84 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 ...
11
votes
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 ...
-1
votes
1answer
177 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 ...
0
votes
1answer
23 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 ...
0
votes
1answer
54 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.
1
vote
3answers
155 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 ...
0
votes
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?
2
votes
1answer
54 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 ...
0
votes
4answers
1k 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 ...
0
votes
0answers
336 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 ...
-1
votes
2answers
167 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 ...
0
votes
2answers
129 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 ...
-1
votes
1answer
140 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 ...
-1
votes
1answer
77 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 ...
1
vote
0answers
59 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 $...
1
vote
1answer
62 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 ...
1
vote
3answers
748 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 ...
-4
votes
3answers
194 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 ...