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Q: When an object's total mechanical energy is NOT conserved?
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Why does the mechanical (total) energy of the skater not change over time?

It certainly does; mechanical energy will be wasted due to friction. Otherwise, if you disregard friction, the fact that the total mechanical energy is conserved follows from conservation of energy.


What is the quantity that remains conserved in all types of collision?

Total mechanical energy


What is conserved sum of potential and kinetic energy?

The sum of potential and kinetic energy is called "mechanical energy". This is NOT conserved, though - unless you consider the microscopic scale, in which case (for example) heat energy is a type of kinetic energy. In this case, the sum is simply the total energy, and the total energy IS conserved.


What is conserved when two object collide in a closed system?

Momentum is conserved when two objects collide in a closed system.


Why doesn't the total mechanical energy in an isolated system change?

The total energy of an isolated system will not change if it has no interaction with the outside.The reason for this is that energy is conserved.(To be exact about it, one needs to be a little picky about what it means means to be isolated. That means no radiation of light and no gravitational interactions and no electromagnetic forces, but that is pretty much understood when one says "isolated.")Mechanical energy does not generally include things like heat, electromagnetic energy and chemical energy, to name a few.Assuming mechanical energy is entirely kinetic and potential energy, then energy is conserved in an isolated system only if the exchange of energy is between mechanical and potential. Expand the definition of "mechanical energy" and you can exchange between any forms of energy in your definiion.That is the only condition that the conservation of mechanical energy is achieved.

Related questions

Is machanical energy always conserved?

No. Total energy is always conserved, but not so mechanical energy.


Potential energy plus kinetic energy equal what?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


Is momentum conserved in inelastic collision?

The energy of the momentum in a collision is conserved through the following occurrences; movement of vehicle(s) after impact, deformation of the vehicle(s) or objects hit, heat and sound.


Why does the mechanical (total) energy of the skater not change over time?

It certainly does; mechanical energy will be wasted due to friction. Otherwise, if you disregard friction, the fact that the total mechanical energy is conserved follows from conservation of energy.


What is the quantity that remains conserved in all types of collision?

Total mechanical energy


What is conserved sum of potential and kinetic energy?

The sum of potential and kinetic energy is called "mechanical energy". This is NOT conserved, though - unless you consider the microscopic scale, in which case (for example) heat energy is a type of kinetic energy. In this case, the sum is simply the total energy, and the total energy IS conserved.


What in a closed system energy is equal to potential energy plus kinetic energy?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


In a closed system what energy is equal to potential energy plus kinetic energy.?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


In a closed system what energy is equal to potential energy plus kinetic energy?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


In a closed system energy is equal to potential energy plus kinetic energy?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


In a closed system energy is equal to potential energy plus kinetic energy.?

Mechanical energy is equal to potential energy plus kinetic energy in a closed system. The total mechanical energy is conserved.


What is the equation for conservation of mechanical energy?

WE+WF=ΔK+ΔUHere,WE=0WF=0Hence, forIf you need more information, then see the link below.