Momentum *** Inertia

[kgruber]

Will somebody please explain these terms to me. I seem to use them interchangeably.

Thanks
Karl

 

[murphey]

Will somebody please explain these terms to me. I seem to use them interchangeably.

Thanks
Karl

In classical mechanics, linear momentum or translational momentum (pl. momenta; SI unit kg•m/s, or, equivalently, N•s) is the product of the mass and velocity of an object:

Like velocity, linear momentum is a vector quantity, possessing a direction as well as a magnitude.

Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion.

In common usage the term "inertia" may refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context. The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion; that an object not subject to any net external force moves at a constant velocity. Thus an object will continue moving at its current velocity until some force causes its speed or direction to change.

momentum is the product of inertia (m) and velocity (v). p=ma.

 

[COFlyBoy]

Momentum is the mass of an object times its speed. Or in mathematical form p = m*v. So something has to be moving to have momentum. A force is required to change an objects momentum.

Intertia is (sort of) an object's resistance to change in momentum. An object at rest will resist acceleration, and an object in motion will resist acceleration (to speed up or slow down). For linear motion the inertia is the mass of the object.

 

[PilotAlan]

For dummies like me, my professor explained:

If large, heavy object has no velocity, it has no momentum. But it still has inertia (it'll take a big push to get it moving).
So, momentum is a function of mass and velocity. Inertia is a function of mass alone.

At least that's what I remember, take it at face value.

 

[denverpilot]

In classical mechanics, linear momentum or translational momentum (pl. momenta; SI unit kg•m/s, or, equivalently, N•s) is the product of the mass and velocity of an object:

Like velocity, linear momentum is a vector quantity, possessing a direction as well as a magnitude.

Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion.

In common usage the term "inertia" may refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context. The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion; that an object not subject to any net external force moves at a constant velocity. Thus an object will continue moving at its current velocity until some force causes its speed or direction to change.

momentum is the product of inertia (m) and velocity (v). p=ma.

Yup. She's a rocket scientist. Really! LOL!

 

[Piloto]

A more interesting question: What causes the Inertia effect?

José

 

[PilotAlan]

A more interesting question: What causes the Inertia effect?
José

The curvature of space-time around an object, as determined by its mass?

 

[murphey]

Yup. She's a rocket scientist. Really! LOL!

nah - wikipedia except for the last sentence. that came from my phisicks book, Halliday & Resnick - the Gold Standard.

I like Alan's explanation better.

 

[olasek]

The curvature of space-time around an object, as determined by its mass?

Hmm... this is what causes gravity.
What causes inertia?
This is like asking what causes Newtonian Laws of Physics. Or what causes principle of conservation of energy. Or what causes electro-magnetism. At some point you write the basic laws of Physics and don't ask what causes them. Super string theory? But then what causes super string theory, etc. God?

The goal of Physics is not to understand "what causes something" but (1). to have clear mathematical formulation of laws of Nature (2) to come up with the most general formulation that would have the broadest possible application (synthesis)

 

[airguy]

A more interesting question: What causes the Inertia effect?

José

Theoretically speaking, the Higgs Boson.

 

[Clark1961]

Hmm... this is what causes gravity.
What causes inertia?

Hmmm, the more important question may be: what causes levity? We all know that levity is the opposite of gravity so it is the important topic!

 

[murphey]

Hmmm, the more important question may be: what causes levity? We all know that levity is the opposite of gravity so it is the important topic!

(*spit take once again*)

I needed this. I'm having an email battle over someone who's PO'd that I didn't send an engraved letter informing him of a monthly deadline. A deadline that's been published & posted every month for years and years.

 

[Richard]

(*spit take once again*)

I needed this. I'm having an email battle over someone who's PO'd that I didn't send an engraved letter informing him of a monthly deadline. A deadline that's been published & posted every month for years and years.

He did not realize the gravity of the situation.

 

[PilotAlan]

At some point you write the basic laws of Physics and don't ask what causes them. Super string theory? But then what causes super string theory, etc. God?

It's FM. In this case, it's PFM.

 

[denverpilot]

At some point you write the basic laws of Physics and don't ask what causes them. Super string theory? But then what causes super string theory, etc. God?

The Flying Spaghetti Monster is made up of strings of delicious pasta.

Coincidence? I think not.

 

[Clark1961]

It's FM. In this case, it's PFM.

I said that about DME and someone wanted to correct me. Guess they don't admit that the factory puts magic smoke in all electrical devices. Regardless of how it gets in there, I know for darn sure that when the magic smoke is released, the darn thing never works again...

 

[Matthew]

I said that about DME and someone wanted to correct me. Guess they don't admit that the factory puts magic smoke in all electrical devices. Regardless of how it gets in there, I know for darn sure that when the magic smoke is released, the darn thing never works again...

Sometimes it doesn't even have to let the smoke out. One of our tech-support guys had a problem many years ago. He installed a UV eraseable EPROM backward. Then he called me because it didn't work. He said he installed the EPROM, the light came on for a second, then it went off, and the unit didn't work.

Me: "The light came on?"
Him: "Yeah, the little light on the top of the EPROM".
Me: "That's NOT supposed to be a light!"

--

It was FM to him.

 

[PilotAlan]

The Flying Spaghetti Monster is made up of strings of delicious pasta.

Coincidence? I think not.

Let's keep this aviation related, please

His smoky appendages are wondrous.

 

[Ghery]

nah - wikipedia except for the last sentence. that came from my phisicks book, Halliday & Resnick - the Gold Standard.

I like Alan's explanation better.

You, too? Boy, that brings back some ancient memories.

 

[PilotAlan]

Hmmm, the more important question may be: what causes levity? We all know that levity is the opposite of gravity so it is the important topic!

If Gravitons are gravity particles, are Levittons then Levity particles?
(maybe not, I've been to Levittown, and I wouldn't call it funny. But maybe there's an observer interaction effect there)

Or if the primary subatomic particle are Quarks, then sub-levity particles are Quips?

This may be the first quantum humor on POA..... But it's humor is relative.

 

[Clark1961]

This may be the first quantum humor on POA..... But it's humor is relative.

Maybe. Of course we must remember that incest is relative. Does any theory of relativity have to consider quantum humour and incest?

 

[murphey]

If Gravitons are gravity particles, are Levittons then Levity particles?
(maybe not, I've been to Levittown, and I wouldn't call it funny. But maybe there's an observer interaction effect there)

Or if the primary subatomic particle are Quarks, then sub-levity particles are Quips?

This may be the first quantum humor on POA..... But it's humor is relative.

Or relativistic?

 

[PilotAlan]

Or relativistic?

You got it.

 

[Piloto]

Hmmm, the more important question may be: what causes levity? We all know that levity is the opposite of gravity so it is the important topic!

Gravity can be described as the flow of the space medium into mass. Much like when you put your hand on the drain of a sink full of water or on a vacuum cleaner hose. The effect appears pulling on your hand but is actually the medium (water or air) pushing your hand down. The "gravity vacuum" is created by the mass that blocks the "pressure" from the opposite side thus creating an unbalance in force. The same space medium is responsible for the inertia effect and the constant speed of light. Just like drag and constant sound velocity in air or water. But unlike fluid mediums were F = K (dx/dt) space medium is F = K (dv/dt).

José

 

[Clark1961]

Gravity can be described as the flow of the space medium into mass. Much like when you put your hand on the drain of a sink full of water or on a vacuum cleaner hose. The effect appears pulling on your hand but is actually the medium (water or air) pushing your hand down. The "gravity vacuum" is created by the mass that blocks the "pressure" from the opposite side thus creating an unbalance in force. The same space medium is responsible for the inertia effect and the constant speed of light. Just like drag and constant sound velocity in air or water. But unlike fluid mediums were F = K (dx/dt) space medium is F = K (dv/dt).

José

Fine...where's the levity?

 

[SkyHog]

Cumberland Gap?

 

[Piloto]

Fine...where's the levity?

Is levity were to exist how would you keep things together. If gravity force were switched to levity (antigravity) this planet would be desintegrated. The closest effect to antigravity observed is that of a nuclear fission. In a normal state the atom nucleus is held together by the nuclear force created by protons and neutrons. When the nucleus is bombarded by a neutron the nuclear force is released and the repulsive force of the protons creates the "antigravity effect" that desintegrate the atom. The neutrons of the desintegrated atom bombard the neighboring atoms thus creating a nuclear chain reaction. Localized magnetic levitation effects has been used in trains and other applications.

José

 

[Capt. Geoffrey Thorpe]

http://www.youtube.com/watch?v=A1vyB-O5i6E

 

[Piloto]

http://www.youtube.com/watch?v=A1vyB-O5i6E

A helium balloon would be a closer example to levitation than any magnetic levitation since it does not require a ground infracstructure.

José

 

[Cap'n Jack]

Is levity were to exist how would you keep things together. If gravity force were switched to levity (antigravity) this planet would be desintegrated. The closest effect to antigravity observed is that of a nuclear fission. In a normal state the atom nucleus is held together by the nuclear force created by protons and neutrons. When the nucleus is bombarded by a neutron the nuclear force is released and the repulsive force of the protons creates the "antigravity effect" that desintegrate the atom. The neutrons of the desintegrated atom bombard the neighboring atoms thus creating a nuclear chain reaction. Localized magnetic levitation effects has been used in trains and other applications.

José

you may want to look up "binding energy" and "mass defect"

 

[Cap'n Jack]

Gravity can be described as the flow of the space medium into mass. Much like when you put your hand on the drain of a sink full of water or on a vacuum cleaner hose. The effect appears pulling on your hand but is actually the medium (water or air) pushing your hand down. The "gravity vacuum" is created by the mass that blocks the "pressure" from the opposite side thus creating an unbalance in force. The same space medium is responsible for the inertia effect and the constant speed of light. Just like drag and constant sound velocity in air or water. But unlike fluid mediums were F = K (dx/dt) space medium is F = K (dv/dt).

José

Reads like the sci.chem trolls are here now.

 

[Clark1961]

you may want to look up "binding energy" and "mass defect"

Have you ever thought about growing a sense of humour?

 

[COFlyBoy]

We haven't even discussed football momentum, which can change without the application of an outside force.

 

[Cap'n Jack]

We haven't even discussed football momentum, which can change without the application of an outside force.

Or primary election momentum where money acts as a force. $3.50=1 pack of fig newton.