Question

A 95kg clock initially at rest on a horizontal floor requires a 560N horizontal force to set it in motion. After the clock is in motion, in horizontal force of 650N

Answer 1

Complete Question

A 95 kg clock initially at rest on a horizontal floor requires a 650 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 560 N keeps it moving with a constant velocity. Find the coefficient of static friction and the coefficient of kinetic friction.

Answer:

The value for static friction is $\mu_s = 0.60$

The value for static friction is $\mu_k = 0.70$

Explanation:

From the question we are told that

The mass of the clock is $m = 95 \ kg$

The first horizontal force is $F _s = 560 \ N$

    The second horizontal force is    $F _k = 650 \ N$

Generally the static frictional force is equal to the first  horizontal force

So

     $F _s = m * g * \mu_s$

=>   $560 = 95 * 9.8 * \mu_s$

=>    $\mu_s = 0.60$

Generally the kinetic frictional force is equal to the second horizontal force

So

      $F _k = m * g * \mu_k$

      $650 = 95 * 9.8 * \mu_k$

     $\mu_k = 0.70$