# 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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### Morison Equation - Value of $k$ not working

Need a hand with the Morison Equation with $k$ giving me a headache. I'm following a video online trying to calculate the force on a structure I am designing for work. I try to follow videos using ...
3answers
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### Are there any explanations for Inertia at atomic level? [closed]

At macroscopic level we can observe inertia. But what explanations are there for Inertia at molecular/atomic/quantum level?
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### Can anyone explain all kinds of motion in the same perspective? [closed]

Imagine an object in space, you hit it with a force equivalent to its mass. The mass first resists due to inertia, but then accelerates with increasing acceleration until reaching a constant speed to ...
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### Which homogeneous solid is the question asking for? [closed]

A question on finding a total moment of inertia states that the object includes a cylinder of negligible mass and radius, is it a slender rod?
1answer
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### Does center of mass change in a complex rigid body if an element with negligible mass is removed?

If you are given an object composed of a sphere with two cylinders attached to opposite sides, and one cylinder is removed (cylinders has negligible mass) would the center of mass change?
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### Why does rotational inertia represent the resistance of a body to angular acceleration

I understand how rotational inertia, $I=mr^2$, is defined based on $\tau_z=mr^2 \alpha_z$ as an analogy to the linear inertia $m$. But I'm still not sure why it represents the resistance of a body to ...
1answer
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### Inertia and related concepts

I recently learned about inertia that it is a property by virtue of which body resists change in it's motion. I want to know what does "resistance to change in motion" actually implies?
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### Are the gravitational mass and inertial mass different qualities of a particle?

I can't understand how the same quality like mass can have different way to be defined. Is mass a quality that resist the movement of a particle in space (inertial mass) or the quality that moves ...
1answer
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### Do objects need some time to know that the forces exerted on them are gone?

Okay, so I know how to solve this question, but I don't quite understand the concept behind it! The solution simply states that the acceleration of m2 after the rope is cut will equal the force of ...
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### Inertia and centrifugal force

So I actually had this thought a long time ago and have been curious about it ever since. I saw something on flying saucers and I was curious about the spinning that they are portrayed to do. That got ...
9answers
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### Why does mass limit acceleration?

If a force of $10\,\mathrm{N}$ is applied to different objects of different mass in empty space, in the absence of gravity, why do lighter objects accelerate faster than heavier objects? Why does mass ...
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### Consistency of premises in a reasoning regarding ( projectile) motion:on using( conterfactually)the inertia principle to determine the upward velocity

My question deals mainly with the reasoning used to solve the problem. Suppose I know a projectile is moving in the XY plan and is sent at the origin with an initial velocity $v_i$ the vector of which ...
10answers
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### Why did we expect gravitational mass and inertial mass to be different?

I've read many times that the fact that gravitational mass is equal to inertial mass (as far as we can tell) used to be a puzzle. I believe that Einstein explained this by showing that gravity is ...
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### Understanding the added mass force and the Basset Force in relation to viscosity and vorticity

The Problem I am trying to understand the forces acting on fully submerged bodies. I have recently read some papers which have called into question my understanding of added mass and the Basset Force. ...
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### Why has the Higgs-field inertia?

The Higgs field is responsible for the masses of all elementary particles. Including the Higgs particle. But doesn't this transfer the question of mass, or inertia, to the Higgs field itself? Why has ...
3answers
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### Trouble understanding the center of mass equation

I'm learning about center of mass, but I have trouble understanding the definition. How is $x_{com}=\frac{1}{M}\sum_{i=1}^{n}m_ix_i$ equal to $x_{com}=\frac{1}{M}\int xdm$? At first I thought it ...
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### The definition of inertia in Mach's principle

Can anyone please explain me Mach's principle, i.e the definition of inertia he has given? I am really not getting what spin and universe have to do with inertia because what we are taught in our ...
1answer
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### What is the minimum force needed to overcome Inertia?

This question arose from this statement: On Mars, weights would be different but the amount of force needed to overcome inertia would be the same. The above statement was from Feynman lectures Vol.1 ...
3answers
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### How does Inertia opposes change in state?

The first line of Wikipedia states that Inertia opposes change in velocity. My teachers also told that Inertia opposes change in state of rest or motion. But I would like to know how? Suppose a body ...
4answers
371 views

### Can we explain velocity without time? [closed]

I'm trying to wrap my head around inertia/velocity, or just change in general, I guess. I'm unsure exactly sure were my gap is, or what question to ask, so I'll explain with a scenario. Lets say I'm ...
1answer
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### Integral Issue for Inertia of Disk

I am currently following Taylor's "Classical Mechanics" and I am trying to understand creating the correct integrals to solve some problems related to the inertia of various shapes. I am to ...
1answer
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### Is centripetal acceleration an inertial acceleration?

I am trying to understand what component of the force on an object moving in a regular bowl enables the ball to complete a "semi circle", without any external force being applied. Is the net ...
2answers
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### What is the definition of mass?

From what I have seen so far, there seem to be two fundamental criteria for considering something to have mass: First is that it must have inertia and therefore momentum, Second is that it interacts ...
2answers
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### Physics of pushing the top of a box a little bit to make it rock back and forth

Context: I'm trying to make a simulation of a box that you can apply force to the top and it will oscillate back and forth until the energy in the system reaches equilibrium again. Visual ...
5answers
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### If inertia is affected by velocity, and velocity is relative, doesn't that mean that inertia is frame-dependent? [duplicate]

Here, by inertia, I mean the tendency of an object to retain its state of motion and resist change. Another way of defining inertia is how much force is needed to create a certain amount of ...
2answers
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### Is inertia and gravity determined by relativistic mass or invariant mass?

As far as I know, mass fundamentally determines inertia and the gravitational force. But since there are two types of mass, which mass determines which? From what I have read so far, and correct me if ...
2answers
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### Is inertia real reason for flow separation?

Consider airflow around square object, when an air particle A comes to the rear edge of an object. It is very logical that the particle would not turn at 90 degrees and follow back side of object, ...
2answers
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### Is there a way to find out how long a body will glide after a force is applied once? [closed]

Can you tell how long a body will retain it's motion after being given a push from x amount of force (ex. 15 force applied, motion will last 18 seconds)?
3answers
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### Is light affected by inertia?

A very popular way used by teachers to explain Einstein's theory that The speed of light is a Universal Constant, is to use an example as follows: Two observers moving relative to each other [let's ...
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### Why are roads sloped inwards in hills?

I recently noticed that the roads were sloped inwards at hills while taking a turn and a question jumped in my mind i understood that it is to provide centripetal force but if it isn't there why would ...
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### Equivalence among three kinds of mass

If there are three kinds of mass (1) resistance (classical inertial mass, rest mass) (2) sensitivity to gravity (weight) (3) creation of gravity, the Eotvos experiment shows the proportionality ...
2answers
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### When a car is coming to a stop is there any resistance offered by it to stay in motion?

Suppose a car is in a state of uniform motion moving at a high velocity and then begins slowing down due to force exerted by the brakes on the car. Will the car offer any resistance due to its inertia ...
1answer
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### What is the gravity/inertia question?

Is the discussion about how gravity and inertia are the same, about the idea that when you hit a ball, it doesn't come back but when you throw a ball up, it does come back?
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### Do pseudoforces arise due to inertia?

Wikipedia says The fictitious force is due to an object's inertia when the reference frame does not move inertially, and thus begins to accelerate relative to the free object. The fictitious force ...
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### Is inertia still considered a mysterious force?

When I first saw, for example, weightless objects in a space capsule, I assumed that pushing them would require no effort because, of course, they did not weigh anything. On Earth, heavy objects are ...
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### Inertia without gravity

Is there inertia in absence of gravity? If I was in a region of space with zero gravity, would I have to apply some force to accelerate a massive body?
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### What is the relationship between the different aspects of mass?

There seem to be several different ways in which mass manifests itself, in particular with reference to fundamental particles: Gravitational mass. Inertial mass. The coupling to the Higgs field. The ...