Question

Give scientific reasons :

(1) Magnet is used to lift heavy iron bar.

(2) An inflated balloon when rubbed against a silk cloth, pulls the hair on our skin.

(3) We are likely to slip when we walk on a oily or wet floor.

Answer 1

(1) A magnet attracts the iron bar. 

As a result it is easier to lift the heavy iron bar using magnetic force.

(2) When an inflated balloon is rubbed against a silk cloth, it develops electrostatic force due to friction. 

This force pulls the hair on our skin.

(3) Wet or oily floor reduces the friction between our feet and surface. 

Hence we are likely to slip on wet or oily floor.