Question

one day at railway station Aman saw that briefcases have rollers attached to it when he asked the reason the teacher told that rollers help to pull a heavy briefcase why it is so?​

Answer 1

Answer:

because rolling gives less friction and it make easy to pull or push any heavy object

Answer 2

Answer:simple rotatory motion is taking place

Explanation:in this case energy and motion both take place from potential to kinetic that is energy and and as the rollers are circular in shape and rotatory motion takes place .And as there are on both sides they could easily lift the heavy briefcase.done!!