Question

Why is pulling a sledge easier on an ice surface? hook than a nile of books on table?​

Answer 1

Answer:

It's easy because both the sled and the ice on the hill are smooth and the surfaces of the sled's runners and the ice slide past one another with little resistance

Explanation:

as you know ,

Friction is the resistance to motion when two such objects rubbed together .

as you know , it is friction that helps in the moving of the ice sled because both the ice and sled are being rubbed together . So  here , friction energy is produced  . Thats why pulling a sledge is easier on an ice surface  .