Question

When a body is in the 1st floor of a building at height 'h',then let its potential energy be mgh.whereas when the body is in the 2nd floor at a height 2h,its potential energy is 2mgh.But in reality,the potential energy doesn't increase as we go higher up a building.Then,theoretically,why does the value become 2mgh in the 2nd floor?

Answer 1

Not sure why you state that potential energy does not increase when going higher up a building. If you discount 'real world' disturbances like air friction, the potential energy will increase with height.

In reality, a falling object will stabilise on a certain maximum velocity and maintain that velocity in flight. The potential energy is then transformed into kinetic energy and this energy does not increase if speed remains the same. Maybe that's the underlying assumption of your statement that potential energy does not increase upwards.

Answer 2

No,u didn't gt my Q clearly.I didn't mean a moving body.i meant a body which is in the 1st floor nd d 2nd part refers to the sme body when it is placed in d 2nd floor but the body is not moving.

Answer 3

IpelletaSaikia, when looking at potential energy, we shouldn't consider any speeds etc. Potential energy is the energy stored in an object due to height, as an example. That's why potential energy of an object WILL increase if you lift it to a higher altitude. I'm not sure if I fully understand your initial statement about 'in reality, the potential energy doesn't increase if we go higher up a building'. This is incorrect in my point of view, as potential energy will increase for sure.

Answer 4

IpelletaSaikia, my apologies for the incorrect spelling of your name. Not sure but believe the spell checker has a life of it's own....

Answer 5

...and again. This time I really typed the right name.

Answer 6

Dude,my name is Ipelleta Saikia.u don't blng 2 india,ri8?oderwse, d nme iz quite cmmon here.nywy, i wud 1ce agn lyk 2 say dat i referred to a body at rst, nt a moving body.nd hence dere is no mntn f ny speed here.bt plz think over dis qstn prprly.if d potential energy had actually increased with height,then a person on the 5th floor can do more work than that of a person on d 1st floor or wat??dat is abslutly silly.

Answer 7

oh..........yeah, u r ri8..jst aftr pstng d answr,d crrct spllng of my nme chngd 2 d wrng one..we need 2 cmplnt 2 d admnstrtr regrdng dis......

Answer 8

Nope, never been to India, but that doesn't matter as long as a correctly typed name (I just copied your name from the original post) gets modified automatically. In addition, you may also want to check OpenStudy courses on language. I know it looks cool to write in turbo language but in reality it reads crap. I'm not going to spend time decyphering your last two responses, so maybe you can rephrase in common language to help me help you again ?

Answer 9

I guess I got my answr.Actually ,1 f my frnd hlpd me out.Nywys,thank u vry much 4 ur suggestions.I vl gt back 2 u agn if i've ny queries in d fture.I thnk i vl chnge my username hereafter.