Is it right to say : whenever there's change in kinetic energy...?

Question

whenever there's change in kinetic energy, there's change in potential energy ? ..

My problem is involving a horizontal force is acting on a horizontally moving particle, then I am asked to find the potential energy U ... how can such particle ( moving horizontally ) have a potential energy ? ...

As I know, a potential energy means mass x g x y .... in above problem there's no change in y ( height ) ....

Please help me figure this point out ... thank you very much

Answer 1

Well, loss in kinetic energy = gain in potential energy and vice versa. But potential energy does not gain in this case as there is no increase or decrease in height of the moving particle. Hence, the kinetic energy is converted from kinetic energy into other forms of energy eg. heat.

Answer 2

> whenever there's change in kinetic energy, there's change in potential energy ?

Nope. The change in kinetic energy equals the NET force on the object, times the distance it moved. This may or may not involve a change in potential energy.

In cases where the only force (hence the net force) is gravity, THEN the change in KE does equal the change in PE. (In general this is true any time that the net force on the object depends only on the object's position.)

This condition (in which net force depends only on position) MIGHT be true of an object moving horizontally--for example, if the object is attached to a horizontally-oriented spring and there's no friction with the table. However, you haven't given enough details about the system to say whether that's true in your case.

Answer 3

The key to potential energy is where are you referencing to. If they object is moving in a strictly horizontal fashion, there in never a change in potential energy. The energy at a point, however, can be calculated if the base level (lowest possible point in y direction) is set below the objects current position.

If the object is on the ground, physicists generally say that it has 0 potential energy. If the object is off the ground, then the calculation is just like you've described above, U = m * g * y.

Remember, potential energy can change with movement (and therefore change in kinetic energy), but if no change in height (y direction movement) occurs, then there will be no change in potential, but potential can still exist if the object is off the ground.

Answer 4

power particularly (sorry so imprecise...it is the best we are in a position to do): An entity that's exchanged between bodies and converted between its varieties to be certain that techniques of interest to ensue. paintings: a mechanical flow of power as a results of an alignment of a rigidity with the displacement of its objective merchandise. Kinetic power: power because of the action of an merchandise. I.e. that's the quantity of paintings (or harm) that the physique can do because it incorporates relax. potential power (particularly): power as a results of place and/or configuration Thermal power: inner kinetic power on the molecular/atomic point as a results of haphazard action of molecules. it is the ability which keeps to be in a physique. assessment thermal power to warmth. think of of it this variety, thermal power is to warmth as kinetic/potential power is to paintings. paintings and heat are reported to be dynamic energies. they're just some thing whilst "you provide it away". potential power varieties, thermal power, and kinetic power are reported to be static power. they're power that exists interior of a physique.

Answer 5

loss in k.e.=gain in p.e.