Answer:
2.The coefficient of sliding friction will decrease
Step-by-step explanation:
Since Fk= μk N
μk= Fk/N
Where Fk= frictional force
μk= coefficient of friction
N= normal reaction
N= mg
Increasing the mass m will increase the value of the normal reaction N thus decreasing the value of the coefficient of sliding friction.
From the above it follows that increasing the mass of the object will certainly decrease the magnitude of the coefficient of sliding friction of the object.