What is the magnitude of the minimum force needed to start the rubber block moving across the dry asphalt?

1 Answer
A08
Mar 12, 2018

Coefficient of friction between rubber block and dry asphalt is

Kinetic #" "# Static
#mu_k=0.67 and mu_s=0.85#

Let #m# be the mass of rubber block. As the block is stationary and is yet to start, we need to use coefficient of static friction.

Force of friction #F=mu_sN#,
where #N# is normal reaction and is #=mg#, on a horizontal surface, #g=9.81\ ms^-2#, is gravity.

Minimum force needed to start the rubber block #=mu_sN#
#:.=0.85xxmxx9.81=8.84m\ N#

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