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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45 views

Why can't we measure inertia? what are the applications of inertia?

why there is less importance for 'inertia' in school studies...does the concept of inertia is least significant nowadays? is inertia a measurable quantity? Is there any application of inertia?
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Why is Newton's First Law not considered a vacuous statement? [duplicate]

How did Newton come to postulate the law of inertia when every inertial body that he was considering was (by his own other hypotheses) being acted on by the force of universal gravitation. In other ...
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Moment of Inertia using centre of mass knowing distance and weight of rod [closed]

I know the mass, I know the center of gravity position. Can i use this to work out the moment of inertia of a rod. So my ruler is 30 cm long and I know its mass to be 11.8g I have some blu tac which ...
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How can energy have inertia?

How can energy have inertia? To my intuition, inertia is so closely associated with mass that my intuition says "Huh?" Indirectly by mass energy equivalence it works fine, for example: I have a ...
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Inertia and related quantities

I wanted to know what is a frame of inertai? Specifically, what does it mean by a frame? I know that inertia is the restistance to motion of a mass, a larger mass resists motion more than a smaller ...
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An expanding, sliding charged tube's self-imposed electromagnetic induction

If I have a simple cylindrical electrically-insulating tube possessing a net electrostatic charge and allow the tube to slide parallel to the tube's axis, that tube will possess electric currents ...
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Definition of mass

In high school physics, I was taught that mass was just how much "stuff" or matter there is in an object. However, now that I am learning physics again in college, I am taught that mass of an object (...
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Calculating end position from existing position, velocity, deceleration and time

I am writing a piece of software where the user can drag an element only on the x axis. When the user lets go of the drag while the item is in motion I can determine the x velocity and the current x ...
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1answer
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Why won't a full laundry basket bounce?

I've noticed a curious behavior of my plastic hamper and laundry baskets. When they are empty tossing them more then a few feet from hip height (3 feet) causes them to bounce and tumble. Yet when they ...
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If the aircraft has no inertia, how will it move after losing power?

If the aircraft has no inertia, how will it move after losing power? I think because of the aerodynamic force, the aircraft stopped moving immediately. Am I right?
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What is the cause of motion in geodesic

The shortest or longest path in curved space between two points is geodesic . What about a body having no potential energy was put in geodesic near earth , what makes it move , May be it is about the ...
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Calculating new mass moments given change in CG and transformation

Given the mass moments of inertia about the CG of the body pre-rotation, and the new CG & rotation matrix1, how can I find the new mass moments about the body's new CG? My CGs are described as ...
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Should the coin be heavier or lighter in the coin drop experiment?

The Coin Drop experiment is a classic experiment used to demonstrate Newton's First Law of Motion. In this experiment, a glass is covered with a card and a coin is place on the card. The card is given ...
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General relativity (gravitoelectromagnetism) and the origin of inertia

On this website describing Gravity Probe B and its importance the author(s) end with this quote and discussion: Pfister sums up current thinking this way in Mach's Principle: From Newton's Bucket ...
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Mass as worldline tension?

In Special Relativity, the equation of motion of a particle of proper mass $m$ is \begin{equation}\tag{1} \frac{d p^a}{d \tau} = \mathfrak{F}^a, \end{equation} where $p^a = m \, u^a$ is the 4-momentum,...
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Can momentum be considered as a measure of inertia of motion?

If inertia of motion is a body's tendency to be in motion then can momentum be considered as a measure to calculate that tendency to be in motion?
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How to calculate the tensor of inertia in this problem?

I have the following geometry for my problem: I'm asked to calculate the tensor of Inertia: $\stackrel{\leftrightarrow}{I}_{O}=\left[\begin{array}{ccc}{I_{11}} & {-P_{12}} & {-P_{13}} \\ {-...
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What happens when the matter is not showing the property of inertia? [closed]

I am trying to imagine a situation when there is no inertia.
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How may the situation, when there is no inertia? [duplicate]

I want to know clearly the real concept of inertia.I have seen lot of definitions regarding inertia.But I could not exactly find real meaning of inertia.
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Why is it impossible to start or stop an object instantaneously? In what ways can a non-accelerating object move? [closed]

Why is it impossible to start or stop an object instantaneously? In what ways can a non-accelerating object move? I think this has to do something with inertia, but I am not exactly sure I fully ...
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Equation for a falling coin tower

I'm referring to the following experiment- https://www.stevespanglerscience.com/lab/experiments/coin-tower/ For a given mass of identical coins stacked upon the other, and a given impulse with which ...
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1answer
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Why are you accelerating yet remaining at a constant speed while going around a curve? [duplicate]

We have to write a rap in physics, and it has to answer a prompt he gave us on this packet. The prompt for the verse I am writing is: Pretend you are driving a car on the freeway going 65 mph. The ...
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What do we mean by straight line in Inertia Law, autoparallel curve or extremal line?

As usually stated: Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed ...
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1answer
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Why does things travel in a straight line in inertial frames?

Why does physical entities travel in straight paths in a flat space-time and in geodesic in curved spacetime? Is it due to Inertia? If it is, then why does waves also follow the same pattern?
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Isn't inertia experience by person in moving bus is Torque

When a bus moves suddenly, the person standing in it tilts backwards. This concept is explained using inertia (tendency of body to resist change in its state of motion) but when the bus moves suddenly,...
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1answer
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How would inertia work in an elevator?

If we imagine standing on a scale inside an elevator, the scale will project our weight. As the elevator starts to move downwards we will not start to move downwards immediately; because of inertia we ...
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What causes a rotating object to rotate forever without external force—inertia, or something else?

Someone told me that it is not inertia, but I think it is inertia, because it will rotate forever. In my understanding, inertia is the constant motion of an object without external force. Am I wrong?
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Mathematical model for transition from mass to energy put in layman's terms [closed]

Mass and inertia are interchangeable, but no intuitive explanation of mass being different for the various particles is known to me. The question I have is: since mass and energy are interchangeable, ...
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Weight and Inertia (are they related?)

R. Feynman wrote in his lecture (The Feynman Lectures on Physics: Chapter-9) "Weight and inertia are proportional, and on the earth’s surface are often taken to be numerically equal, which causes a ...
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Is there still no known origin of the law of inertia?

To quote Feynman at about the 21 minute mark of the first Messenger Lecture on The Character of Physical Law, ...that the motion to keep it going in a straight line has no known reason. The reason ...
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In zero gravity!

If spacecraft moving in a stable speed or acceleration suddenly stopped would an astronaut continue moving forward (such as a man in a train) ?
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How can a flywheel make engine run smoothly?

In the video Moment of Inertia Demo, a man states that moment of inertia will be higher if the masses are away from the axis of rotation. The engine take more power to spin the flywheel, because of ...
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Where exactly is inertia stored? [closed]

Suppose you have the power to take a snapshot of an object containing all its information. Say a ball was thrown to a direction to your right and you took a snapshot of it. This snapshot contains all ...
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Looking for ways to transform time-series data recorded from object movement into equation describing the movement direction of the object

Looking for some time-series data transformation advice! I want to know what's the best way to transform data of 9-tuples time series data of IMU (Inertia Measurement Unit) sensor, recorded from a ...
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Isn't inertia experience by person in moving bus same as torque

When a bus moves suddenly, the person standing in it tilts backwards. This concept is explained using inertia(tendency of body to resist change in its state of motion) but when the bus moves suddenly, ...
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8answers
2k views

What if Force was not Mass times Acceleration? [closed]

We know that Force equals Mass times Acceleration, $F = ma$. But what if we had a law like $$F=m^2a$$ or $$F = 2ma~?$$
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1answer
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Why is the ratio of gravitational force and the inertia to resist it 1?

Is there a deeper meaning behind how things of different mass fall at the same acceleration? It feels so perfectly balanced...
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When do we illustrate inertial forces on inertial frames of reference?

I came across two practice questions wherein an object was attached to an accelerating vehicle, yet only one of these cases required an inertial force to be illustrated on the object's free body ...
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How does the inertia of granules within a rotating cylinder affect its inertia?

If a cylinder is partially filled with granules and is rolling down an inclined plane, is there any relationship between the rotational motion of the granules and the motion of the cylinder? I'm ...
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Why does mass cause resistance to acceleration?

If I were in a vacuum with no gravity or friction, why would it be harder to push a floating bowling ball than a marble? Is there anything happening on an subatomic level that makes matter act ...
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Why doesn't a ball thrown upwards fall behind us if we're moving forward?

If we consider ourselves traveling in a bus and if we a throw a ball upwards, the ball should fall behind us according to law of inertia, right? If so why doesn't the ball always fall behind us each ...
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Convert inertia formula to excel calculator

I've been looking at this question: "Weight" of moving object in a car collision but to be honest I can't get my head around how to work it out myself (I'm not a physics student!). What ...
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Spiral lamp chane state speed [closed]

Question is how fast halogen lamp reach it full temperature, going from cold (not light) state to full light emit state. how fast in milliseconds it takes, imagine: if led lamp work instantly like 0 ...
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1answer
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Inertia of a falling weight

I use a standard device (penetrometer) that uses a 10 kg weight that is dropped a constant distance to cause a probe to penetrate soil. The penetration distance after 4 blows is recorded. If I were to ...
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Relation between Fisher Information Matrix and Inertia Matrix

I have been wondering whether there is a relation between the Fisher Information Matrix in a stochastic particle system and Inertia Matrix?
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Calculating inertia of motor

I'm currently working on a project, and for futher calculations down the road (the controller of the mechanical system) I need to calculate, as accurately as possible the interia of the system. I'm ...
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2answers
114 views

Which fundamental force underlies inertia? [closed]

We learn about the four fundamental forces (gravity, electromagnetism, strong, weak). I am curious about how these four forces mediate/cause/drive everyday phenomena. In particular, it has never been ...
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Why is Quantized Inertia considered pseude-science? [closed]

In the criticism section of the Wikipedia article to Quantized Intertia it is stated that QI is considered pseudo-science. Unfortunately none of the linked but in none of the provided links can I find ...
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Cube tumbling over

When a moving cube hits a low step (the step is perpendicular to its velocity) and tumbles over, is its angular momentum conserved? It is implied that it is so, but certainly gravity produces a torque ...
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Calculate stroke force and angle for a ball rolling on a surface to reach a destination position (optimal golf putt)

I'm trying to find an algorithm which calculates the optimal golf putt (angle, force) given a 3D surface (obtained through Poisson reconstruction), start and destination position (hole). I guess that ...

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