Question

give reason fo the following

please do this class 8 science friction​

Answer 1

Answer:

e) ball bearings are used in machines as they offer lesser friction as compared to other bearings.

f)tyres of machine parts due to friction suffer from wear and tear so they have to be changed..

g)To reduce friction lubrication is done one such example is machine parts being frequently oiled or greased

h)stream lined objects being converged at tip and bottom and being diverged at body are ideal for flight for many reasons one such reason is that they reduce air resistance.

I)on icy roads there are less irregularities hence lesser friction to hold a body we need friction as we know tyres offer lesser friction so metal chains are wrapped around them to increase friction

j)Rollers are used for transporting luggage as rolling objects offer lesser friction(rolling friction) having lesser irregularities as lesser surface is in contact..