# Determine the coefficient of friction between the washer and the horizontal surface

Determine the coefficient of friction between the washer and the horizontal surface, if during free movement on it, the washer slows down with an acceleration of 2 m / s2.

1. According to Newton’s second law, a = F tr / m, where m is the mass of the washer, a is the acceleration of the movement of the washer, F tr is the friction force.

2. The friction force, by definition, is calculated by the formula: F tr = k * P = k * m * g, where k is the coefficient of friction, P is the weight of the washer, m is the mass of the washer, g is the acceleration of gravity, which is 9.8 m / s2.

3. That is, we got the equation: k * g * m / m = a. Hence k = a / g = 2 / 9.8 ~ 0.2.

Answer: The coefficient of friction is approximately 0.2. One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.