Question

why it is hard to work on smooth surface such as glass & ice​

Answer 1

Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. ... It is harder to move things when there is a lot of friction holding them back, but if there were no friction at all, people would slip and slide around whenever they took a step.

Answer 2

Answer:

every surface even though it appears smooth has roughness because of ups and downs on microscopic level, in substances such as glass the surface has comparitively lesser ups and downs thus less friction (caused due to interlocking in ups and downs ) and are smooth and slippery and don't provide necessary friction to work firmly making it hard to work.