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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!

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4k views

What is the relationship between gravity and inertia?

What is the relationship between Gravity and Inertia? Einstein told us that gravity and inertia are identical. And from the fact that two different masses fall at the same rate, I believe we can say ...
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What is meant in mass' definition 'resistance to acceleration'? [closed]

Wikipedia: Mass is both a property of a physical body and a measure of its resistance to acceleration What does this mean? I know of the $E=mc^2$ formula. I think, the energy required to '...
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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 ...
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Why is Disturbance Force Equal to Total Force in Stokes Flow?

So this step confuses me. Why is it true that the disturbance force is the total force in stokes flow? Any advice or guidance would be great! From Pozrikidis' book:
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The Inertial theory of Sciama and an electromagnetic analogue

In 1952 D. W. Sciama introduced a paper On the origin of inertia. It presents a method in which inertia could arise from other mass in the universe. It goes along these lines: If you try to ...
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1answer
39 views

Centrifuge Artificial Gravity?

I just saw the following video: NASA centrifuge. In video, a person is walking on a huge spinning centrifuge. But his weight is still acting downwards and there is no supporting force which will keep ...
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How does a wheelie work?

So I've been trying to create a mathematical model for an electric motorcycle and began to wonder about the maximum possible torque that could be supplied to the rear driven wheel without having the ...
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1answer
42 views

Calculating weight needed for a fixed pole

Imagine a game of swing ball, where the rope is 1m long, and the ball weighs 1kg. How do you calculate the weight that the pole has to be so it does not get pulled over, assuming it is not burried in ...
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2answers
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How does inertia work at the particle level?

I've read recently that the mass of a proton is mostly not given by the Higgs mechanism. But rather it's given by the energy of quarks moving around inside the proton and gluons and other internal ...
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What's the seconde moment of a T beam with a heel?

the seconde moment of area of a rectangle is Iy = (bh^3)/12 b : base h : height What is the second moment of area of a T beam like this one ?
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Do the inertial mass and gravitational mass of an object depend on the frame of reference?

My understanding is that the "relativistic mass" of an object means any of the following three quantities (which are all identical): The "mass-energy", as defined by the formula $m = E / c^2$. The ...
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1answer
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Faraday's Law and the Law of Inertia

Faraday's Law can be stated qualitatively as : Any loop (of wire) opposes/resists the change of magnetic flux through it. The Law of Inertia states that any physical object resists its change in ...
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Golf ball curving to right or left when putting along a slope

I will use the example of a golf ball here, but there are many other examples I guess. My question is: A golf ball is at rest on an incline that slopes from right to left. I take it the force from ...
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Does buoyant force become less effective as acceleration increases?

Lets say a balloon with a certain amount of buoyant lift has a 2 kg mass strapped to it (including engines) and accelerates enough that it perceives a positive 2.5 g inertial force (2.5g * weight) ...
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1answer
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Does potential energy increase inertial mass of system?

For example, we have a ball with mass m lying on the Earth. Then we lift it to a height h. So, now system Earth-ball have potential energy $E_p = mgh$. From Mass–energy equivalence system got $mass = \...
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Does the nucleus have less inertial mass than sum of inertial masses of constitute protons and neutrons?

In nuclear fusion part of nucleons' rest mass goes into radiation energy. Does it mean that inertial mass of result nucleus decreased?
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What is “Radiation damping stronger than inertia.”

I'm reading a paper on creating gamma rays in a lab and I've come across a phrase I simply don't understand; "Radiation Damping Stronger Than Inertia". As I understand it radiation damping is just ...
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327 views

Why charge is not a measure of inertia?

We know that mass is the measure of inertia of rest. Then why charge is not a measure of inertia? What causes the difference between charge and mass?
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If there were no inertia would perpetual motion be possible? [closed]

Is it not inertia that makes a flywheel resist being put into motion? And if that is true, is inertia a consequence of being unable to create energy, i.e., why perpetual motion machines do not in fact ...
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Does a box containing photons have more inertia than an empty box?

A box containing photons gravitates more strongly than an empty box, and thus the equivalence principle dictates that a box containing photons has more inertia than an empty box. The inescapable ...
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The relation between mass, inertia and energy

I have trouble understanding the following concept: I learnt that mass is a measure of inertia, and that seemed logical enough. Yet separately I learnt that mass is a form of condensed energy. If ...
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3answers
863 views

The principle behind Inertia and it's connection to Equilibrium

Inertia is the tendency of a force-free body to remain in that state or it is something that opposes any act of changing its equilibrium state. Mass is a measure of inertia. I have some questions ...
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Inertia and momentum

Question #1: Why does speed have nothing to do with inertia? Question #2: If a car hits a steel wall and stops, where did the momentum go?
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How to find the axis with minimum moment of inertia?

If a system of particles is given, in a 2D plane, with particles having masses $M_1$, $M_2$, $M_3, \ldots M_n$ and coordinates $(x_1,y_1)$, $(x_2,y_2)$, $(x_3,y_3), \ldots (x_n y_n)$, then how can one ...
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Hyperloop without acceleration feeling

I have a question about hyperloop. Is it possible to create a hyperloop with high acceleration and that the passengers dont feel the acceleration, theoretically speaking? And is a situation possible ...
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1answer
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Inertia when pulling on a rope [duplicate]

Imagine a fragile cord attached to a ceiling with its other side attached to a sphere. On the lower part another cord is atrached to the sphere. Now visualize you pull STRAIGHT downward on this cord. ...
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Difference between Mass and Inertia

My questions is about mass and Inertia, what is the difference between Mass and Inertia? Are they the same or different? How? I am really confused with it,some says mass is the measure of Inertia, ...
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119 views

Are mass or inertia the same thing, the same properties?

I think so. But I wold like to know another opinions to confirm.
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107 views

Overcoming the inertia of a body at rest

Neglecting friction and other forces (air resistance) and assuming all forces are orthogonal the gravity vector , consider a large dense sphere at rest on a perfectly flat plane which is plumb. Now ...
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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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Can the origin of mass or inertia depend only of the gravitational field of matter? [closed]

The gravitacional field is directly proportional to mass or inertia. It doesn't have another property or field like this, with this power. I think that when we apply a force to an object, the ...
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1answer
154 views

Inertial stresses in Reynolds number

What is meant by the inertial stress in the definition of Reynolds number? Reynolds number = Inertial stress/ viscous stress
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475 views

Why do 2 bodies of different masses reach the ground at the same time? [duplicate]

Since inertia is the quantity that resists change in motion, and is represented by mass, and if two different objects are dropped from the same height, shouldn't the heavier mass accelerate less than ...
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How do I convert cardinal axis inertias to an arbitrary axis inertia?

I've tried to reduce this problem to the most basic form. I know the equation for a spring-mass system is generally: $$ F_{\mbox{applied}} = kx + m\ddot{x} \\ $$ but, in my case, I have a spring ...
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Gravity vs Electricity see-saw analogy and speed of light

Does electricity exhibit anything like the following steps: 1) A ball is rolled down from left side of a very long teeter-totter or see-saw 2) The see-saw rapidly (immediately) tilts once the ball ...
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Inertia on a rotating disc?

If I toss a ball upwards in a train moving with uniform velocity, the ball will land right back in my hand. This is because the ball has inertia and it continues to move forward at the speed of train ...
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1answer
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Explanation of the classic jerk and pull string system [duplicate]

It is known that when we jerk the bottom string quickly, it will break; and if we pull slowly the top string will break, while the force applied is the same. My confusion is: according to Newton's ...
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1answer
170 views

Is Newton's third law due to inertia?

Newton's third law states that each force has an equal and opposite force. If I kicked a ball, it would apply the same force on me. Is this due to the ball's inertia? To clarify, is the ball exerting ...
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1answer
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What happens when a electrically charged object is moving away from a charge it is attracted to(read description) [closed]

When a electrically charged object that carries momentum and inertia is attracted to a electrical field and is moving away from it, does it lose momentum as it is pulled towards it, or does it circle ...
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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 ...
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1answer
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How to stop the propagation of waves?

I am trying to understand Newtonian equivalent law of inertia for the waves. Roughly Newton's law of inertia says that an object which is in motion in space will continue to remain in motion unless an ...
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2answers
581 views

Is a heavier baseball bat better than a lighter one?

Baseball season is coming up and I would like to know which bat is best for me. I think the heaviest bat I can swing good would be the best, but my brother thinks the lightest bat would be the best so ...
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1answer
158 views

What determines the amount of inertia of matter?

what factors would increase or decrease inertia, i.e. require more or less energy to change the velocity of matter from what is currently required all else being equal? I have heard of mach's ...
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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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Can I model objects as point masses when calculating rotational inertia? [duplicate]

I have an aircraft. On it are weapons. Weapons have masses and centers of masses. The larger aircraft system has a center of mass. I wish to calculate the cumulative rotational inertia of only the ...
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Does Inertia “conflict” Entropy?

Earth continues to spin because of inertia. Does this fact "conflict" the entropy of the universe? Since the tendence is towards disorder, how is Inertia of planets Spin related to Entropy?
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Sciama's paper, On the origin of inertia

In his paper "On the origin of inertia", Sciama identifies $\frac{\Phi + \phi}{c^2} = -\frac{1}{G}$ This identity has confused me because I wonder how the right hand side arises since $\frac{\phi}{c^...
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1answer
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Is the inertia of light equal to the inertia of mass under $E=mc^2$?

Under $E=mc^2$, 1kg of matter has $9\times 10^{10}$ joules of energy. So, if I had just the light shining from $9\times 10^8 $ 100 Watt light bulbs inside a perfectly reflective box, would that light ...
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Mass, Weight and Inertia

In The Feynman Lectures on Physics Vol-1, it is written How hard it is to get a body going is one thing, and how much it weighs is something else. Weight and inertia are proportional, and on earth'...
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Is it possible to measure inertial mass without gravity or rolling?

Is there a reliable (and ideally, easy to construct+tune) method of measuring inertial mass without using gravity (e.g. weighing on a scale or a freefall apparatus or a pendulum) or rolling (e.g. ...