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How much is the force of friction between a wooden block of mass 5 kg and the horizontal marble floor? The coefficient of friction between wood and marble is 0.6. (30 N)
Solution:
Mass = m = 5 kg
Coefficient of friction = µ = 0.6
Force of friction = FS = ?
FS = µ R (where R = mg)
FS = µ mg
FS = $0.6 \times 5 \times 10$ = 30 N