A 2 kg block is on a rough horizontal surface with μ = 0.5. A time-dependent force F = -t² + 6t acts from t = 0 to 6 s. Which statement is incorrect?

Question

G1 Physics · Accepted Answer

The applied force has maximum value at t=3 s: Fₘₐₓ = -9+18 = 9 N. Limiting friction is μmg = 0.5×2×10 = 10 N, so the block never moves and static friction simply equals F. Therefore the maximum actual friction is 9 N; statement C is incorrect.