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  5. Friction

8th Class Science Friction Question Bank Friction Formative Objective Problems

  • question_answer
    A body of weight 50 N is placed on a smooth surface. If the force required to move the body on the surface is 30 N the coefficient of friction is

    A)  0.60                      

    B)  1.2     

    C)  0.3                        

    D)  1.67

    Correct Answer: A

    Solution :

      The force of friction on a body sliding on a horizontal surface is, \[F=m\text{ }mg\] Given, \[F=30\text{ }N,\text{ }mg=50\text{ }N\] \[\mu =\frac{F}{mg}=\frac{30}{50}=0.6\] The correct answer is A


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