Question

Some machines use streamlined shape to reduce friction. Name them.

Answer 1

Streamline shape is used to reduce the friction by the objects moving in fluids(air and water). 

The general machines using Streamline shapes are:–

I. Airplanes.
II. Ships.
III. Bullet Trains.
IV. F 1 Cars.

All those objects which are pointed from forward to cut the air every time and get inside it and throw it backward like a bullet.