Questions tagged [inertia]
Inertia is the tendency of a body to oppose changes to its state of motion. DO NOT USE THIS TAG for moment of inertia or inertia tensor!
467
questions
0
votes
3
answers
55
views
Why is the moment of inertia the rotational analog for mass and not inertia?
I've thought that both mass and the moment of inertia measure an object's inertia, one being in translational motion and the other in rotational motion. That has made complete sense to me, but in my ...
- 11
-1
votes
2
answers
70
views
Why does binding energy of particles, which constitutes most of macroscopic mass, make them harder to accelerate?
I've seen a lot of questions on this topic so please don't misunderstand, I understand E = mc^2 and SEMF and so on. I specifically want to know how internal forces within lets say a nucleus make it ...
1
vote
0
answers
24
views
Evolution of a rotating system in which mass continually leaks [closed]
this might be a trivial problem but me and a friend have failed to solve it. This is not homework, it actually relates to a book of mine but that is of no interest. Imagine the following;
Two masses $...
- 308
0
votes
0
answers
17
views
Mass moment of inertia flipping in different mediums
Consider someone performing a front flip in the water versus in the air. Assume the body position in both cases to be identical. In which case would the mass moment of inertia be greater and why?
Prof ...
0
votes
1
answer
52
views
Is this the correct way to integrate orientation given torque and inertia tensor?
I am trying to develop a 3D rigid body simulation in C++ in which I had some conceptual doubts on how to integrate for orientation given the total torque applied to a rigid body, and it's initial ...
1
vote
3
answers
159
views
Geodesic equation: Bridging the gap between inertia and gravity
The geodesic equation can be expressed as:
$$\frac{\mathrm{d}^2 x^\mu}{\mathrm{d}\tau ^2} + \Gamma _{\alpha \beta} ^\mu \frac{\mathrm{d}x^\alpha}{\mathrm{d}\tau} \frac{\mathrm{d}x^\beta}{\mathrm{d}\...
- 21
0
votes
2
answers
35
views
Can we achieve infinite movement from one initial burst of energy?
If there was a large enough vacuum chamber, and it was a perfect vacuum, could we potentially throw something and have it move infinitely? When you throw something, say a football, it travels through ...
1
vote
1
answer
255
views
What would be an experimental test of Sciama’s theory and why it has not been pursued yet?
Recently I came across a video were the origin of inertia was attributed to Sciama’s paper (1953).
I have seen only a couple of questions regarding this topic on Stack Physics. Both of them are ...
- 289
1
vote
1
answer
111
views
Did Newton know that light has no inertia? [closed]
Newton studied a lot about optics and gravitation. Did he realize to some extent that light is a massless particle? How does his theory explain the bending of light due to a gravitational field?
- 195
1
vote
4
answers
56
views
How to calculate time needed by an object to change its state of motion when an net force applies to it (inertia)?
(Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This tendency to "...
- 11
0
votes
1
answer
135
views
In a moving car / bus when the car suddenly accelerates do we go back due to inertia or is it due to pseudo force?
When an car moves forward we go back and we have always read that the reason was that our legs stay in contact with the ground and our body goes back since it was at rest and with sudden motion it ...
1
vote
1
answer
54
views
Why the orientation of an object on Earth rotates with the rotation of earth? Is this due to friction?
The moon always faces toward Earth. That's because the moon rotates itself while revolving around the earth. This might be the result of tidal force for a long time, but what about objects on Earth? ...
- 25
1
vote
2
answers
127
views
How do you calculate kinetic energy in a convention where the one-way speed of light is anisotropic?
The question about measuring the one-way speed of light has been debated in several posts in this forum, and are treated in detail on this wiki page.
In relation to this debate, I wonder how you would ...
0
votes
0
answers
53
views
Maxwell's wheel - moment of inertia vs damping coeff
I am investigating the relationship between the moment of inertia of a yoyo-like apparatus (maxwell's wheel) and its damping coeff. I am adding disks to my yoyo to change its moment of inertia, which ...
- 1
0
votes
0
answers
24
views
What is exactly particle inertia in a fluid-particle mixture?
In a mixture of a cylindrical particle and the carrier fluid, what exactly particle inertia refer to? (let's neglect gravitation force and Brownian motion).
When the size of particles are small (...
- 11
0
votes
2
answers
133
views
What experiment should be conducted?
Im self studying physics and came to this question in my textbook:
A passenger in a moving bus with no windows notices that a ball that had been at rest on the aisle suddenly start to move towards ...
1
vote
0
answers
23
views
Can added mass depend on stochasticity of motion?
Can added mass (also called virtual mass or induced mass) of a voluminous object in a massive fluid surrounding be affected by some stochastic motion of the mass (relative motion between the object ...
- 966
2
votes
1
answer
85
views
How does Newton's First Law show the existence of inertial reference frames? [duplicate]
Newton merely stated the law of inertia as:
An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced ...
- 37
2
votes
4
answers
167
views
Does it take more energy to bring a car to a halt if it is still accelerating on impact than travelling at constant speed?
So, my physics is quite rusty, been out of varsity for a while.
A friend asked me this and I am still pondering. Here is the scenario:
2 Cars are travelling towards a wall, and make impact with the ...
- 29
1
vote
0
answers
104
views
Why does the ball in Galileo's double inclined plane experiment reach the same height?
Why does the ball in Galileo's double inclined plane experiment reach the same height? I know how to show it by energy conservation law but am unable to prove it by the equations of motion. Can anyone ...
- 91
2
votes
2
answers
687
views
Can someone explain 'virtual mass' in fluids in simple words (for a dummy/high schooler)?
so I recently came across the term 'virtual mass' and when I looked up more about it, it just gave me some stuff about fluid mechanics that I dont understand properly. My understanding of virtual mass ...
1
vote
1
answer
40
views
Can the inertia factor of a black hole be used to infer its density profile?
The Sun's inertia factor of ~0.07 suggests a stark contrast between the density of its outer shells (very low density) and its core (very dense). The same applies to the rest of the solar system. ...
- 11
0
votes
1
answer
67
views
What's the reason an airplane turning 180° from strong headwinds causing it to have no ground speed does not stall?
I saw a video of a small propeller plane hovering over the ground due to strong headwinds but then turns 180 degrees and flys away. I was trying to figure out if the plane shouldn't be stalling ...
- 1
1
vote
1
answer
98
views
Inertial Mass = Gravitational Mass. Why? [duplicate]
Okay, so the inertial mass of an object is always equal to the gravitational mass of the object. Conceptually, however, they seem different. Then what makes them identical? Is it because they are ...
- 1,065
3
votes
1
answer
97
views
Tree falling without inertia while people stay suspended in air for a split second due to inertia
I recently saw a video ( watch it 0.5x speed ) of a slanted coconut tree on the bank of a river in India breaking due to the weight of the kids who climbed on it.
The tree seems to have broken near ...
- 33
0
votes
0
answers
64
views
Doubt regarding lifts (and inertia?)
so i was thinking about lifts and i am confused.
let's say there is a body within a lift (system at rest). Now if the lift starts to accelerate downwards with say an acceleration a ($a>g$). The ...
- 13
0
votes
1
answer
160
views
If a stone is dropped from a hot air balloon, is the initial velocity $u=0$, or is it equal to the velocity of the balloon $u=V_{balloon}$?
In theory, since the stone acquires the velocity of the balloon, it should go upwards slightly before coming down since it's velocity is equal to that of the balloon (in upward direction). But ...
- 131
0
votes
0
answers
47
views
Why we can take for granted that energy binding is associated with inertial mass?
It is common to state that a proton is bounded state of three quarks, and that the QCD energy binding (associated to a "cloud" of gluons joining together the three quarks) is responsible for ...
- 1,640
23
votes
7
answers
3k
views
Does the bias in a loaded die depend on gravity?
Suppose I bias a cubic plastic die by incorporating a lead pellet hidden just behind the '1' face, so that the probability $P_6$ of rolling a 6 is greater than the symmetric 1/6. Its exact behaviour ...
- 10.1k
13
votes
5
answers
2k
views
How does inertia affect an object suspended in a fluid?
When I asked my physics teacher how fully submerged objects are suspended in fluids, she told me it was because the object's density was equal to that of the fluid's as a result of the net force ...
- 145