Donaldparida wrote:
[...] when we lift an object(standing on the Earth),
OK
we do positive work on the object
These words are improper: in this case we do work against gravitation, not on the object.
and so the energy of the object should increase
No, if we exclude the transient we lift the...
Brucew wrote: "for example, gravity, a basic intuitive idea of the concept is that massive things are attracted to each other. like there is some invisible arm between the two objects, pulling them towards each other. Using just this intuition, you can already say something about gravity. You...