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

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pls solve question 8

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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.

Asked By: RAMBIR MALIK
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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

Asked By: DIPESH
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Joshi sir comment

Why do you want to consider this, I do not know, yet if you consider them as a body and make free body diagram then apply friction on the two blocks separately, in one it depends on k1 and in second it depends on k2. No concept of k1 + k2 is there in physics

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