Which is a suitable method to decrease friction

  • A

    Ball and bearings

  • B

    Lubrication

  • C

    Polishing

  • D

    All the above

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  • [IIT 1980]

The maximum static frictional force is

Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with $1\; m s^{-2}$. What is the net force on the man? If the coefficient of static friction between the man’s shoes and the belt is $0.2$, up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man $= 65 \;kg.)$

Which of the following is self adjusting in nature?