Under the action of a force f = 2h, a bar with a mass of 0.2 kg moves with an acceleration of 6 m / s2. find the friction force.

The friction force can be found by the formula F (tr) = F – m * a, where F (tr) is the friction force, F is the force applied to a given body, m is the body’s mass, a is the acceleration of the body.
Taking into account the conditions of the problem, F (tr) = 2 H – 0.2 kg * 6 m / s ^ 2 = 2 H – 1.2 H = 0.8 N.
Answer: F (tr) = 0.8 N.