To find the sliding force of the bar, we project all the forces onto the ОХ axis (we assume that the bar slides on a horizontal surface): m * a = 0 = F – Ftr, from where we express: F = Ftr = μ * m * g.
Constants and variables: μ – coefficient of friction (μ = 0.45); m is the mass of the bar (m = 30 kg); g – acceleration due to gravity (g ≈ 10 m / s2).
Calculation: F = μ * m * g = 0.45 * 30 * 10 = 135 N.
Answer: The sliding force of the bar is 135 N.
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