All Questions
Tagged with relative-motion rotational-kinematics
23
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The stupidest question ever on relative kinematics and angular velocity [duplicate]
I am scratching my head on a very basic formula whose meaning escapes my intuition.
On basically all texts of mechanics the following result is derived:
Suppose that a rigid body is moving with ...
- 130
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2
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59
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Euler Rotation Equations and invariance of vectors in different reference frames
Consider two frames, one which is inertial and the other one rotating w.r.t. to the inertial frame. Say there is a rigid body having angular momentum which is same/invariant in both frames. How is it ...
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1
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How does relative motion work for an extended object?
I have this conceptual doubt which might be flawed very badly but I don't understand this particular thing. For example, if one end of a stick is moving with velocity $v_1$ and the other with $v_2$, ...
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Does relative motion allow for speeds $>c$?
If motion is relative, (so if X was stationary and Y was moving at v m/s, we could think of this as Y being stationary and X moving at -v m/s), could we not create a scenario in which a stationary ...
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To find the displacement of a rolling body
When calculating the displacement of a rolling body do we just calculate the displacement due to Vcom in a particular time t or additionally need to consider also the displacement that may be produced ...
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1
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Angular velocity of a particle in uniform circular motion about a general point
This problem was given by our professor.
Consider a particle P executing uniform circular motion wrt the point O with uniform angular velocity $\omega$ anticlockwise whose cordinate is $(2R,0)$ in a ...
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5
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Is rotational motion relative, as is linear motion?
In special relativity only relative velocity is what matters. A rocket and the universe can be in relative linear motion. In the rocket the universe is in motion. The universe got this motion when it ...
user307025
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Relative angular velocity of one point with respect to another on a solid rigid body [closed]
What is relative angular velocity of A wrt B and that of A wrt C in the figure given below?
Description:
A, B and C lie on a solid cylinder(rigid body) rotating with a constant angular velocity $\vec{...
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How can different points on a rigid body move with different speeds but also be relatively at rest?
For a rigid body rotating with a constant angular speed, the points near the axis must have lower linear velocity than the points farther away. If they have different linear velocities, they must have ...
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1
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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 ...
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1
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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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What are the necessary conditions for relative angular velocity to be defined? [closed]
I have certain doubts related to the definition of relative angular velocity .My textbook defines it in the manner given below:-
$$\omega_{AB}=\frac{v_{AB}}{r_{AB}}$$
$\omega_{AB}$ is the relative ...
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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 ...
4
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Rotating table with a groove having a ball within
A circular table of radius R is rotating with an angular speed Ω. It contains a groove of lenth L starting from the center of the the table and running along the radius vector of the table. A ball of ...
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Friction & relative motion
If there are two bodies that have zero relative velocity, does that mean friction will not exist between them, since friction opposes relative motion. In the figure below i have two wheels A&B, ...
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Motion of earth wrt. objects?
To "outrace the Sun" (or rather the earth) in Arctic latitudes, one
can go much more slowly. Above Novaya Zemlya, on the 77th parallel, a
plane doing about 450 km. p.h. would cover as much as a ...
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3
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2
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Is there any video I can use to visualise why velocities change in moving rotating reference frames?
Suppose we have a car A moving along a straight path and another car B moving in a circular path. I know from the formula I have studied that the relative velocity of A as observed by B will not ...
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If the Earth is in constant motion then why do we say that an object is in a state of rest?
I got this question as my physics class homework for tomorrow. Anyone please help me out.
If Earth constantly rotates and revolves, then how can we call an object in a state of rest?
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1
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How can we find velocity, acceleration etc, of a revolving particle with respect to an observer inside the circle (not at center)? [closed]
A particle is revolving in horizontal a circle of radius $R$ with constant speed of $|\vec{v}|$ and constant angular velocity $\omega$. There is another observer standing inside the circle, at a ...
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4
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Puzzling : Relative motion of two points on a rotating disc
Consider two points on a radial line for a rotating disc. One point, $A$, is at the circumference and the other, $B$, is at distance $R/2$ from disc's centre. Relative velocity of $B$ w.r.t. $A$ ...
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The Earth is spinning, so why don't we jump and land on a different location?
I know there are similar questions on StackExchange but I think it is different and detailed.
The earth is spinning 465 meters/second so why don't we jump and land on a different location?
I googled ...
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If I jump will I land in the same spot? [duplicate]
If I were to jump one meter in the air and hang for one second, would I fall back down in the same spot or would the earth rotate ever so slightly under me, causing me to land a short distance away ...
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Earth moves how much under my feet when I jump?
If I'm standing at the equator, jump, and land 1 second later, the
Earth does NOT move 1000mph (or .28 miles per second) relative to me,
since my velocity while jumping is also 1000mph.
However, ...
user854