Name: Necessity of Friction
Uploaded: 2019-07-19
Duration: 4 min 40 s
Description: This video enables students to learn about friction, friction used in routine activities, loss of energy in the form of heat due to friction.

Question

Explain how the shape of an aeroplane reduces friction.

Accepted Answer

Fluids exert a force of friction on objects moving through them. The frictional force exerted by a fluid (air or water) is called drag (or drag force). When objects move through fluids, they have to overcome friction acting on them. In this process, they lose energy. Efforts are, therefore, made to minimise friction. So, objects are given special shapes. The fluid friction (or drag) can be reduced or minimised by giving special shape called 'streamlined shape' to the objects which move through fluids (like air or water). When an object having a streamlined body shape moves very fast, then the fluid (air or water) can flow past the moving object smoothly, reducing the fluid friction (or drag). An aeroplane has a streamlined shape to reduce air friction (air resistance or drag) that it encounters when flying at high speed through the sky.

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