Tagged Questions

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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When Does Mass Matter? [on hold]

I have been trying to wrap my head around this idea for a month or so, and I am not really sure how mass plays into the velocity of a moving body. I have not taken physics in a while, but one thing I ...
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Does a wave have inertia?

In de Broglie hypothesis, particles have wave nature. The question is does this wave have inertia? If so is it represented in the corresponding wave equation?
My question is about the inertia coefficient on second law. To be more specific I have doubts on the notation. 1) Some authors show that the force $F$ is proportional to mass $m$ times acceleration $... 3answers 102 views What is the connection between inertial/gravitational mass and relativity? In Einstein/Infield 's The Evolution of Physics (32-35) the authors establish that inertial mass and gravitational mass are the same and then connect this to relativity.Throughout these pages I was ... 0answers 27 views A trio of spinning marbles My little brother showed me this devised act in which he stuck three marbles in a triangular pattern When he spun any of those marbles, the triplet would first rotate normally, but moments later, ... 3answers 63 views Why does overcoming inertia depend upon time? When a paper over a glass is pulled suddenly, the coin over it falls to the water. But on pulling it slowly, the coin gets pulled along with the paper. Why does the coin in the former case not feel ... 1answer 27 views Moment of inertia of the sphere [closed] My teacher has written (I is the moment of inertia of sphere) : I (about x axis) = I ( about y axis ) = I( about z axis) =I then the summation of them is equal to 3*I = 2*I(c) where c is the center ... 1answer 30 views Inertia for a large mass (in outer space) I understand that an object doesn't need a force to keep moving; that it will keep moving indefinitely in that direction at that speed. My question though is: if you were in outer space, where ... 4answers 158 views Rotating the bucket in circular motion without spilling water In the bucket experiment when the bucket reaches the top of the circle why will it have a normal force acting on the water downwards? Doesn't normal force oppose any other force? There is no force ... 1answer 34 views Why bikes are made lightweight? From Wikipedia: The most important characteristics about a racing bicycle are its weight and stiffness. If I understand correctly, the greater the weight of the body, the greater its inertia (... 4answers 2k views 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 ... 3answers 101 views Centripetal and Centrifugal force If water stays in a pail of water that is whirled around a circular path, the water stays in the pail. But is it because of centripetal force or inertia? I'm getting confused by all the different ... 1answer 39 views Moment of inertia and gravity Would the objects have moment of Inertia if there was no gravity? Because imagine a bar, if I put my hand at the center of the bar and rotate it, it would be easier than rotate the bar picking one ... 1answer 317 views What is the meaning of “moment”? What is the meaning of moment? I'm little confused about the word as there are some terms like moment of momentum, moment of mass, moment of force, etc. I want to know what exactly is meant by the ... 0answers 14 views Inertial force of fluids [duplicate] Reynold's number is the ratio of inertial force to viscous force.I also know the definition of inertial force.but where does a fluid get this force from?what are the factors responsible for this force?... 1answer 25 views What is the minimal G-force curve in 2-dimensional space? Given two parallel roads, which need to be connected, what shape of curve would produce the minimum overall horizontal G-force(s) on travelers? Is it a$sin$or$cos$wave? Is it a basic cubic ... 2answers 74 views What is the relationship between potential energy and inertia? It seems to me that the two are very similar! Potential energy seems to either explain, or partially explain, directly or indirectly, the law of inertia. I already know that bodies do not move because ... 1answer 27 views Does stretching a spring with a relatively high spring constant value require more force because of its inertia? Other than the fact that a spring has a relatively high spring constant (say 1000 N/m) and therefore requires more force per meter to stretch (not bend or twist). 3answers 69 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 ... 1answer 115 views Can you lift heavy objects in zero gravity? [closed] I'm not someone who majored in physics and i never took the subject seriously when i was in school and im regretting that alot, there's so many things going in my mind that i cannot answer because i ... 1answer 51 views Question about friction in rolling without slipping? I was under the impression that for a ball/cylinder to roll without slip, there must be a static friction force that opposes the direction of motion. Why, in this case, does the friction act in the ... 3answers 92 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? 1answer 37 views How to compensate a top-heavy platform [closed] I have a small four-wheeled platform weighing 1.3kg with a height of 30cm. Its center-of-mass is located at 75% of the height, making it a little top-heavy. I empirically measured the angle at which ... 3answers 3k views Could an asteroid land slowly on Earth's surface? The concept in my mind is that an asteroid is on a vector similar to Earth's, but slightly slower (e.g., 50kmh slower). As Earth passes it, it enters the atmosphere at a sharp angle, and since Earth ... 2answers 75 views Does mass as a measure of inertia have a meaning in zero gravity? [duplicate] Mass apart from the amount of material, is also a measure of the inertia of an object, ie. the resistance to change its motion. In zero gravity, does still mass count as the amount of inertia? In ... 1answer 46 views Newton's second law of motion and viscosity [closed] In a Coutte flow, the applied force on one of the plates can be expressed by$F = \eta A \frac{dv}{dz}$. F here can also be defined using Newton's second law of motion,$F = m \frac{dv}{dt}$. The ... 1answer 68 views Does inertia have anything to do with conservation of energy? [closed] I have googled this and not found anything. It seems to me that if objects at rest did not resist being accelerated (which is what I once thought was the case in outside of gravity like in outer space)... 0answers 24 views Why is a network pattern (weaving pattern) stronger than a whole solid surface of the same material For example badminton racquets and huts. 1answer 46 views Friction Resulting from Differing Masses A friend and I are curious about something. We created a ramp from some wood (like a skate ramp) that's not purely circular in nature. We did so with the intent to test how the mass of an object can ... 1answer 49 views Reason behind Inertia Has any physicist work on the reason behind Inertia? Why do we have inertia only during acceleration? No inertia during constant velocity. 2answers 159 views Concept of mass In classical mechanics, there seems to be a need to distinguish between inertial and gravitational mass. Some texts show how the concept of mass may be defined with some mathematical rigor. There is ... 2answers 169 views Does the Inertia of a Cue Ball Affect its Reflection Angle off a Resting Billiard Ball? Consider the following Diagram in which a Cue Ball (A) of mass M is shot twice at another pool ball with identical mass M. When the force with which the cue ball (A) is hit (v1) is increased (v2) ... 4answers 117 views When is the direction of the static friction negative? i thought that the force of static friction exerted on an object is always going in the opposite direction of any other force exerted on the same object. however, this problem seems to disregard that ... 1answer 90 views How does an Atoms electric field overcome an electrons inertia? An electron has mass, and therefore has inertia. How does an atoms electric field perpetually overcome an electrons inertia, necessary to hold it in its shell? Does this require continual work to be ... 1answer 43 views “Mass is a measure of an object’s ability to resist motion or movement of any kind” This statement is presented as wrong, but I dont understand why. Specifically, what is the diff between motion and "movement of any kind"? Its to do with a question about inertia. I understand that ... 2answers 83 views Mass, velocity and inertia [closed] If 5 ozs of weight is my engine, and this weight starts in the back of a four wheeled vehicle traveling down a decline gaining speed due to the engine mass to allow its inertia to carry it across a ... 1answer 49 views Doubts About Force and Inertia! But then what does inertia mean at all!? Cant we calculate how much it resists the applied force? I mean considering an imaginary plane with no friction but gravity as of Earth and an enormous mass of ... 0answers 15 views Understanding the inertia matrix of a tilted ellipse I would like to control the rotation of an ellipse which is tilted by 45° with respect to the rotation axis, and I need to calculate the inertia of the load on the shaft. To be clear, on this figure I ... 1answer 82 views What causes the skidding of the wheels of a moving car? Momentum or inertia? In a moving car, when brakes are applied suddenly the wheels skid.I have these two explanations in my mind and both seems correct to me.1. The momentum of the car must be conserved so the car ... 1answer 68 views How to sensor Jerk=$d^3{\bf r}/dt^3$, or higher derivatives (4th, 5th, 6th order) when applied in the equation of motion of a ballistic missile? Given a 6th order differential equation of motion as usually used in ballastic missile dynamic models. What kind of sensors are usually used to measure Jerk, (or higher order derivatives in kinematics)... 1answer 125 views How do I calculate the moment of inertia with velocity? [closed] How do I calculate a total moment of inertia when I have point mass with velocity? It looks like this: If I understand correctly, firstly I have to find a center of mass. What do I do next? 1answer 156 views How do momentum get transferred? Simple Question , Consider two objects namely$A$and$B$where$B$is stationary and$A$is moving towards$B$with velocity$v$. When the two objects touch each other what does actually happen ... 2answers 58 views Double the mass in the universe, double the inertia If I double (halve) the mass in the visible universe, will my inertia double (halve)? I think it should, at least as soon ''I have received the news of this doubling''. But what does the General ... 0answers 34 views Charged Universe and charge-dependent inertia/anti-inertia I posted this same question as a follow up for the main question here. I expected to get a quick answer but since none have come up I raise it as a topic in its own right. So the question is: Suppose ... 0answers 70 views The Inertial theory of Sciama and an electromagnetic analogue In 1952 D. W. Sciama introduced a paper On the origin of inertia. It presents a method in which inertia could arise from other mass in the universe. It goes along these lines: If you try to ... 1answer 75 views Difference between first newton's law and second newton's law ? [duplicate] the first and second laws of newton are both similar, so why do we need the first law if it is the same as the second? what is the big difference between these? 1answer 77 views Is there a gravitational radiation reaction force? As you may know, the linearized relativity theory (or gravitoelectromagnetism), obeys equations analogous to Maxwell's equations in electrodynamics. These equations in ED result in the troubling ... 2answers 78 views What makes energy content of a body harder to accelerate it? There was this video http://www.youtube.com/watch?v=Xo232kyTsO0 where the host explains the "Real meaning of$E=mc^2 $" by saying that even at the most microscopic level even the fundamental particles ... 1answer 159 views An apparent contradiction to$m = m_0/\sqrt{1-v^2/c^2}\$ [duplicate]
In Goldstein's Classical Mechanics book in the chapter about the dynamics of rigid bodies the equation $$\dfrac{dL_i}{dt}+\epsilon_{ijk}\omega_jL_k = N_i$$ is presented. Now, in one exercise, we are ...