Question

Is potential energy be negative? when?

Answer 1

Yes - and most often it is.

For example, think of gravitation.

If you are on Earth, the only place where you have zero gravitational potential energy is infinitely far away from Earth (and the sun etc etc).

So what do you do to get there? You addkinetic energy to your system, so it rises up the potential well. You keep on addingenergy until, finally, you end up at infinitely far away - with 0J of energy.

So, you had some value of energy, added a load to it...and got 0. Logically, the initial  must be less than zero!



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Answer 2

its not negative always ..

but when the object is frm motion and than it go on to the rest than the potential energy become negative.

Yes,potential energy can be negative. Potential energy is a relative concept which depends on the frame of reference which has been chosen as zero potential. ... When an object enters Earth's gravitational field, kinetic energy is released while the mass of the object doesn't change to reflect this gained energy.

hope it helps u