1.

A 20 kg body is pushed horizontally with just enough force to start it moving across a floor and thesame force continues to act afterwards. The coefficient of static friction and sliding friction are 0.7 and0.6 respectively. The acceleration of the bod is

Answer»

As we know that static friction = coefficient of static friction * normal reaction of the bodythat is friction = (u)Nalso N=(m)(g) =20* 10 = 200 N ( By just taking g= 10 m/s^2static friction = 0.7 * 200 = 140 Nwhen the external force will be applied on body .it will be start moving so in this case kinetic friction= 0.6 * 200 = 120 N

so the net force will be difference of both type of friction = 140-120 = 20 Nwe know thatF= ma soa=F/mso by butting values 20/20 =1 m/s^2



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