Reducing friction

Friction can be reduced by

• providing wheels

• lubricating

• polishing

• all of these

Which would not be a way of reducing friction?

• by polishing moving parts

• by lubricating moving parts

• by making surface rough

• by making surface smooth

This activity will...

• increase friction

• damage machine parts

• not affect friction

• decrease friction

Wheels on a skateboard most likely experiences-

• reduced friction

• increased friction

• no any change on friction

• can not say

These processes will...

• increase friction

• decrease friction

• there will be no any affect on friction

• can not say

This picture shows an example of ....

• sliding/kinetic friction

• rolling friction

• static friction

• none of these

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

The bodies of aeroplanes are also streamlined to minimize

• friction

• static friction

• drag/fluid friction

• rolling friction

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

• wheels

• electricity

• ball bearings

• static friction

The roughness of a surface can also be reduced by

• oiling

• ball bearings

• lubricating

• all of these