Editor

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)

Difficulty: Easy

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

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