Method of decreasing friction:By polishing: Friction between two surfaces can be reduced by polishing them. The interlocking and projections are minimized by this method.
Ball-bearing: As the rolling friction less than the sliding friction consequently in rotating machinery, the shafts are fixed on the ball bearing so that the friction can be reduced considerably. For example-the free wheel of a cycle, the axle of a motorcar, the shafts of the motor dynmo etc. are provided with ball-bearing.
<span><span><span>Lubricants: </span>Friction between two surfaces can be decreased by using lubricants. A lubricant is a substance (a solid or a liquid) which forms a thin layer between the two surfaces in contact. It also fills the depressions present in the surfaces of contact and reduces friction considerably. In light machinery thin oils with low viscosity are used, in heavy and fast moving machinery thick oils and solutes (grease) are used.
</span><span>Streamline<span>: </span>The friction due to air is reduced by making the automobiles streamline.</span></span>
Methods of increasing friction:By making the surface rough friction can be increased. Examples of increasing friction-the tires of a motor car and bicycles are made rough to increase the friction .when a ground or surface become slippery after rain or water splashing it is made rough by spreading sand to increase the friction.
L = length of side of square = 0.400 m
d = length of the diagonal
using Pythagorean theorem
d = sqrt(L² + L²)
d = sqrt(2L²)
d = sqrt(2) L
r = distance of each small sphere from the center
from the diagram , we see that
2r = d
hence r = d/2
r = sqrt(2) L/2
r = L/sqrt(2)
moment of inertia is given as
I = m r²
total moment of inertia of four spheres is given as
I' = 4 I
I' = 4 m r²
I' = 4 m ( L/sqrt(2))²
I' = 4 mL²/2
I' = 2 mL²
inserting the values
I' = 2 (0.2) (0.4)²
I' = 0.064 kgm²
Saturn is very commonly known for its rings