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Question: 

A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor.

  1. What is the coefficient of static friction between the box and the floor?
  2. If the 35.0-N force continues, the box accelerates at $0.60 \textrm{ m/s}^2$. What is the coefficient of kinetic friction?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $0.60$
  2. $0.53$

Giancoli 7th Edition, Chapter 4, Problem 37

(2:28)