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Physics_is_beautiful
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- questions on inertia
Just a thread to see how inertia works, just studied the laws of motion, and have been fascinated with it.. could use some help on it tho :)
As I mentioned in your New Member Introduction thread, it is best for you to post links to the reading you've been doing so far. Please do that so we can do a better job of helping you. Thanks.Physics_is_beautiful said:TL;DR Summary: questions on inertia
Just a thread to see how inertia works, just studied the laws of motion, and have been fascinated with it.. could use some help on it tho :)
DaveE said:It's hard for us to help if you don't ask a question. We don't know what's confusing you.
Here are some good short lectures about Newton's laws.
https://www.khanacademy.org/science...on-s-first-law/v/newton-s-first-law-of-motion
It depends what you mean by "cause"? Matter generally has the properties of mass and electric charge. Those lead to the two fundamental forces of classical physics: gravity and electromagnetism. Mass is also the property that determines how fast a body accelerates under a given force. See Newton's second law: ##F = ma##.Physics_is_beautiful said:To clarify, I have been particularly puzzled by what causes inertia,
ps - thanks for the links.
In this sense it's also part of my physics vocabulary, but only when I'm within the Newtonian world view :-).PeroK said:Inertia isn't really part of my physics vocabulary, other than as another name for mass.
It's the fact that states of uniform motion can't be distinguished from one another.Physics_is_beautiful said:To clarify, I have been particularly puzzled by what causes inertia,
You might have to expand on that!Mister T said:It's the fact that states of uniform motion can't be distinguished from one another.
I think you need to see that inertia is not a property of classical physics. The best you will find is an obscure reference like it's the tendency of an object to resist a change in momentum. But really it's best not to dwell on it. You won't find inertia defined in reputable physics textbooks (and don't get me started on Wikipedia!)Physics_is_beautiful said:To clarify, I have been particularly puzzled by what causes inertia,
ps - thanks for the links.
Inertia is a feature of classical physics named "mass". Or, to be more precise, "inertial mass".Sailor Al said:I think you need to see that inertia is not a property of classical physics. The best you will find is an obscure reference like it's the tendency of an object to resist a change in momentum. But really it's best not to dwell on it. You won't find inertia defined in reputable physics textbooks (and don't get me started on Wikipedia!)
If you mean mass, than, mass is the term to use. If you mean momentum, then use momentum.
Inertia really isn't a useful concept in physics.
What do accepted theories say about the equivalence of gravitational and inertial mass or is it an experimental observation?jbriggs444 said:Inertia is a feature of classical physics named "mass". Or, to be more precise, "inertial mass".
Free objects have no ability to resist changes in momentum. If you apply a force to them, they will gain momentum at a rate proportional to the applied force. In fact, "force" is defined as a rate of transfer of momentum. With a coherent system of units, momentum changes at a rate equal to the applied force, not just proportional.
If you want an object to resist changes in momentum, it is easy to accomplish. You nail it down, screw it in place and brace it securely. Now any applied force will be resisted by the support structure, reducing the change in momentum.
Reducing it on the target object anyway. Momentum is conserved. If a force is applied, that momentum transfer will manifest somewhere. If you have a truly external force and you push on a box nailed to the Earth, the Earth will move in response. If you, standing on the kitchen floor, are pushing a box that is nailed to the kitchen floor, you'll get the same result as lifting on your own bootstraps.
Google for the equivalence principle which states that they are identical.Frabjous said:What do accepted theories say about equivalence of gravitational and inertial mass or is it an experimental observation?
Inertia is the tendency of an object to resist changes in its motion. It is a property of matter and is directly related to an object's mass.
Understanding inertia is important because it helps us explain and predict the behavior of objects in motion. It also plays a crucial role in the laws of motion and is essential in many fields of science and engineering.
Inertia is affected by an object's mass and its velocity. The greater the mass of an object, the greater its inertia. Similarly, the greater the velocity of an object, the greater its inertia.
Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force. This law is directly related to inertia, as it explains the tendency of objects to resist changes in their motion.
In order to overcome inertia, an external force must be applied to an object. This could be in the form of a push, pull, or any other type of force. The greater the inertia of an object, the greater the force needed to overcome it.