science
Grade-3
Easy

Question

Pick the odd one out.

hintHint:

The friction is the highest when two rough surfaces rub against each other. Friction is the least when two smooth surfaces rub against each other.

The correct answer is:


    Walking, Erasing and wearing out of shoe soles are all examples of friction between two rough surfaces. Brushing is an example of friction between a rough and a smooth surface. Hence, brushing is the odd one out.