A mass is initially at rest on the floor of a truck

PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

A 30 kg30\text{ kg} mass is initially at rest on the floor of a truck. The coefficient of static friction between the mass and the floor of the truck is 0.30.3, and the coefficient of kinetic friction is 0.20.2. Initially, the truck is travelling due east at constant speed. Find the magnitude and direction of the friction force acting on the mass in each case. Take g=10 m/s2g=10\text{ m/s}^2. (1) The truck accelerates at 1.8 m/s21.8\text{ m/s}^2 eastward. (2) The truck accelerates at 3.8 m/s23.8\text{ m/s}^2 westward.

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