You are trying to slide a refrigerator across a horizontal floor.The mass of the

Question

You are trying to slide a refrigerator across a horizontal floor.The mass of the refrigerator is 188kg, and you need to exert a force of 347 N to make it just begin to move. (a) What is the coefficient of static frictionbetween the floor and the refrigerator?
1

(b) After it starts moving, the refrigerator reaches a speed of1.5 m/s after 4.5 s. What is the coefficient of kinetic frictionbetween the refrigerator and the floor?
2 (a) What is the coefficient of static frictionbetween the floor and the refrigerator?
1

(b) After it starts moving, the refrigerator reaches a speed of1.5 m/s after 4.5 s. What is the coefficient of kinetic frictionbetween the refrigerator and the floor?
2

Explanation / Answer

mass=188 s=co-efficient of static friction g=accleration due to gravity=9.8 static frictional force=s*188*9.8 since 347 N of force is needed to just move the block 347=s*188*9.8 s=0.19 (ans 1) let acceleration=a m/s2 t=4.5 v=1.5 u=0 v=u+a*t 1.5=0+a*4.5 a=0.33 m/s2 force causing the the acceleration=mass*accleration=188*0.33=62.67N let co-efficient of kinetic friction=k kinetic frictional force=k*188*9.8 62.67+k*188*9.8=347 k=0.154 (ans 2)

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