Wheels on a skateboard most likely experiences-

This picture shows an example of ....

Fish and birds have naturally ........... bodies

The bodies of aeroplanes are also streamlined to minimize

Bicycles and fans are some common objects that make use of ..... to reduce friction

The roughness of a surface can also be reduced by

Rolling friction is ............... than sliding friction

Friction does not depend on the weight of the moving object

Friction wears down the parts of machine

A force can increase the mass of an object

A box kept on the floor demonstrates ...

Tyres of vehicles are provided with grooved designed to decrease friction