Question

Vehicles are streamlined to reduce
A. Static Friction
B. Kinetic Friction
C. Liquid Friction
D. Sliding Friction

Answer 1

Hint: Whenever an object is moving friction comes into the picture. Friction is a kind of force that opposes the movement of an object. Even when the object moves in the air, the air molecules will exert friction upon the moving object. So whenever an object moves in the ground or air the objects will have to oppose the frictional force to keep moving. Similarly, water and other liquids exert a frictional force on the objects that are moving through them.


Complete step by step solution:
Any substance that can flow is called fluid. Since both gases and liquids can flow they are called fluids. These fluids exert frictional force towards the objects moving through them. This frictional force is called fluid friction or liquid friction.
Vehicles are streamlined to reduce this liquid friction.
.Therefore the correct option is C.


Fast-moving vehicles are stream-lined in shape. This is because this shape cuts through the air easily which in turn increases the speed of the vehicle. Boats and airplanes are also given this shape to reduce fluid friction. These frictional forces exerted by the fluids are called drag. So all the objects like ships, airplanes, and cars will experience this drag. This drag depends upon the speed of the object with which it moves with respect to fluids. The faster the object moves the greater the object experiences the drag from the fluids.

Note:
This fluid friction also depends on another factor which is the shape of the object. If the shape of the object is flat it experiences greater drag. If the object has a narrower or sharper edge it experiences lower drag. This drag will make the objects moving to lose a lot of energy. And that is why moving vehicles are in a streamlined shape. We have learned this from the birds and fishes. They have pointed shapes in the body which makes them spend less energy to travel longer distances.