A body weighing 3 kg moves evenly along a horizontal plane. The coefficient of sliding friction of the body over the surface is 0.2. The friction force is
To find the value of the friction force that should act on a given moving body, we use the formula (we take into account that for a horizontal surface N = Ft = m * g): Ffr = μ * N = μ * m * g.
Constants and variables: μ – coefficient of sliding friction (μ = 0.2); m – body weight (m = 3 kg); g – acceleration due to gravity (g ≈ 10 m / s2).
Calculation: F = μ * m * g = 0.2 * 3 * 10 = 6 N.
Answer: The friction force is 6 N.
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