Question

Find the mass of the refrigerator, which is just started moving by a force of 6,350 N along a tile floor with a coefficient of friction of 0.30:

Answer 1

Take μ = 0.30 and g = 9.8 m/s². At the threshold of motion F = μmg, so

m = F/(μg) = 6350 / (0.30·9.8) ≈ 6.35×10^3 / 2.94 ≈ 2.16×10^3 kg.

So the refrigerator's mass is about 2.16×10^3 kg (≈2160 kg).