suppose we have a ball held at a certain height above the ground where it has 0 KE and x potential enegy. as its release it fall down with uniform acceleration so its KE starts increasing while its GPE starts decreasing. Now suppose a ball is acted upon by a force (say air resistance) causin it to fall with constant speed where it has constant KE while its GPE is decreasing. Where is this energy missing going to?> heat due to friction with air? doesnt seem really convincing to me that all the lost GPE is converted to heat. a question in one of my excercises asked: explain how can a sphere falling through a liquid have a constant KE but decreasing GPE/? i assumed this is relevant so im putting it across too.