Which of the following is true about the coefficient of static friction $\left(\mu_s\right)$ and the…

Which of the following is true about the coefficient of static friction $\left(\mu_s\right)$ and the coefficient of kinematic friction $\left(\mu_k\right)$
  1. $\mu_s$ is always equal to $\mu_k$
  2. $\mu_s$ is always greater than $\mu_k$
  3. $\mu_s$ is always less than $\mu_k$
  4. Depending upon applications. $\mu_s$ can be greate less or equal to $\mu_k$

Solution

Graph of friction is as shown
So, Limiting value of static friction $>$ Kinetic friction $ \begin{array}{cc} \Rightarrow & \mu_s N>\mu_k N \\ \text { or } & \mu_s>\mu_k \end{array} $

Asked in: AP EAMCET 2022 (07 Jul Shift 2)

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