How do you calculate the coefficient of kinetic friction using only the velocity

Question

How do you calculate the coefficient of kinetic friction using only the velocity and time. Ex.: You are trying to slide a refrigerator across a horizontal floor. The mass is 187kg and you need to exert a force of 340 N just to make it move. After it starts moving, the refrigerator reaches a speed of 1.9 m/s after 4.9 s. What is the coefficient of kinetic energy between the refrigerator and the floor. How do you calculate the coefficient of kinetic friction using only the velocity and time. Ex.: You are trying to slide a refrigerator across a horizontal floor. The mass is 187kg and you need to exert a force of 340 N just to make it move. After it starts moving, the refrigerator reaches a speed of 1.9 m/s after 4.9 s. What is the coefficient of kinetic energy between the refrigerator and the floor.

Explanation / Answer

Use F=m*a, where F is the sum of the forces (you pushing, minus the frictional force), m is mass and a is acceleration. Frictional force is normal force (m*G) times the coefficient. a = 1.9 m/s / 4.9s = 0.3878 m/s^2 m = 187 kg F = (340 - m*g*uk) = (340 - 187*9.81*uk) (340 - 187*9.81*uk) = 187*0.3878 solve for uk (coefficient of kinetic friction) uk = 0.1458 Thats pretty low, but then again 1.9m/s is pretty fast to be pushing a refrigerator, so i assume you just made up the example.

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