Here is the definition FROM AN AUTHORITATIVE SOURCE, once again:
Inertia is the resistance an object has to a change in its state of motion.
Whether it is moving or or at rest, an object HAS INERTIA.
Right now, in front of me is a 21 inch computer monitor that masses approximately 110 Lbs. It has momentum.
"What?!" you cry... "it is at rest."
No, my friend, it is NOT at rest. It is currently moving in an easterly direction approximately 900 miles per hour... and it is moving around the sun at approximately 67,000 MPH and it is moving around the Galaxy center at approximately 250,000 MPH.
The amount of momentum carried by this Monitor is stupendous. Just using the larger of these we find my monitor has 20,000,000,000 Kg*m/s of Momentum. Thank God its momentum and vedtor happens to be shared by almost everything else in the neighborhood.
Rokke, there are different ways of pumping energy into things. You can wind up a spring or a rubber band to power a toy. You can throw a rock, loading it with the energy of your arm (which, until it hits something, keeps that energy stored in the form of MOMENTUM). to kill a small animal or to break a window. You can pick up a book moving it higher in the gravity field (adding to its energy) and put it on a high shelf where the potential energy is stored in its position, logically called positional energy. These are all examples of MECHANICAL ENERGY which has two forms: Potential and Kinetic.
Consider a pendulum... it cycles between the two states of mechanical energy as it swings. At the end of its swing it has NO kinetic energy but a great deal of potential energy... at the bottom of its swing it has the largest amount of kinetic energy but no potential energy. As the pendulum rises to its peak of swing, the energy is being converted to potential energy... as it falls it is being converted back into kinetic energy. At the top of each swing the pendulum has ZERO relative MOMENTUM (it does still have inertia). At the bottom of the swing it has the greatest amount of Momentum.
There is a relationship between work (applied force) and mechanical energy change. Whenever work is done upon an object by an external force, there will be a change in the total mechanical energy of the object. If only internal forces are doing work (no work done by external forces), there is no change in total mechanical energy; the total mechanical energy is said to be "conserved."
You yourself have said momentum = mass * velocity.
Oh, you invoked Einstein: remember e = m*c^2???
e = energy, M = Mass, c^2 is a velocity squared. Think about it.
I again suggest you do a little studying... you may learn something. I know it takes an effort. But then you wouldn't display your ignorance for the virtual world to see.
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Source,
Inertia is a quantity which depends solely upon mass. The more mass, the more inertia. Momentum is a quantity in Physics which depends on both mass and speed.
So even your own "authoritative source" identifies them as different. Now strap on one half of a testical and admit you are wrong.
With regard to the rest of your blathering, I offer you some quotes from your "authoritative source":
Kinetic Energy: "Kinetic energy is a scalar quantity; it does not have a direction. Unlike velocity, acceleration, force, and momentum, the kinetic energy of an object is completely described by magnitude alone."
Here is another good website for you to go to Kinetic Energy is NOT Momentum
Potential Energy: potential energy is the energy which an object has stored due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height position. An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position.
"I again suggest you do a little studying... you may learn something."
I did. I learned you have an inability to admit you are wrong. Now about that motorcycle jump....