# 70 - Newton's laws of motion and friction Questions Answers

pls solve question 8

Joshi sir comment
Joshi sir comment
Joshi sir comment

Concept of pseudo force

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Will get the video soon

A small body of mass m=0.30kg$m=0.30kg$ starts sliding down from the top of a smooth sphere of radius R=1.00m$R=1.00m$. The sphere rotates with a constant angular velocity ω=6.0rad/s$\omega =6.0rad/s$ about a vertical axis passing through its centre. Find the centrifugal force of inertia and the Coriolis force at the moment when the body breaks off the surface of the sphere in the reference frame fixed to the sphere.

Irodov 1.2 Q61

two touching bars 1 and 2 are placed inclined plane forming an angle alpha with horizontal the masses of the bars are equal to M1 and M2 and the coefficient of friction between the inclined plane and these bars are equal to K1K2 respectively with the k1>k2 . find
a) the force of interaction of the bars in the process of motion

b) the minimum value of the angle alpha at which the bars start sliding down

my doubt;

if I consider them to be 1 mass system , then what would happen to the resultant friction coefficient of the 1 mass system , would it be k1 + k2 ?

thank you