Consider a setup with a horizontal table, two masses, a string, and a massless, frictionless pulley. Assume the masses are m1=1.8 kg and m2= 1.2kg. Also, assume that uk=0.20 and us=0.30. The masses are released from rest.  a. I claim that there is a sufficient net force to get the system sliding. Do a calculation to show that I am right. Include some written explanation to justify your calculation.  b. If m2 starts from rest at 0.50 m above the ground, how long does it take to hit the ground?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.