science
Grade-3
Easy
Question
Pick the odd one out.
Hint:
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.
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