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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 |
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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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