All Questions
Tagged with relative-motion rotational-kinematics
23
questions
14
votes
5
answers
17k
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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
10
votes
6
answers
10k
views
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?
- 279
9
votes
5
answers
3k
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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 ...
- 6,355
5
votes
7
answers
26k
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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 ...
- 167
4
votes
4
answers
4k
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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. $A$ ...
- 41
4
votes
1
answer
1k
views
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 ...
- 395
3
votes
2
answers
720
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 ...
3
votes
2
answers
117
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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 ...
- 346
2
votes
1
answer
206
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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 ...
- 190
1
vote
1
answer
6k
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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 ...
- 13
1
vote
1
answer
76
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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 $v_2$, ...
- 123
1
vote
2
answers
59
views
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 ...
- 11
1
vote
0
answers
43
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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
1
vote
1
answer
67
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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 ...
- 178
0
votes
2
answers
90
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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 ...
