With what force does friction prevent a 3 N block of wood from moving along a wooden ruler?

P = 3 Newtons – weight of a wooden block;
k = 0.3 is the coefficient of friction between wood and wood.
It is required to determine the friction force F friction.
F friction = k * N = k * P = 0.3 * 3 = 0.9 Newton.
Answer: the friction force is 0.9 Newton.

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