Question

Fluid friction can be reduced by:

• A. using ball bearings
• B. streamlining the shape of the object
• C. using lubricaants
• D. increasing the density of the fluid

Answer 1

The correct option is B streamlining the shape of the object

Fluid friction depends upon:
(i) nature of the fluid: if the density of the substance is increased, fluid friction increases.
(ii) speed of the object moving in the fluid- the fluid friction increases with the increase in the speed of the object.
(iii) shape of the object- the shapes of the objects moving in fluid are made streamlined to reduce the friction offered by the fluid.
Hence, fluid friction can be decreased by streamlining the shape of the objects.