Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. The correct arrangement is :

Explain why, objects moving in fluids should have streamlined shape.

A boy runs his toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be :

A big wooden box is being pushed on the ground from east to west direction. The force of friction due to ground will act on this box towards:

A spring balance can be used to measure

A) Mass of an object

B) Force acting on an object

C) Density of an object

D) Weight of an object