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

How can you reduce the drag on something moving through the air?

What is meant by 'streamlined shape'? Name an object which usually has a 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 :

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