10) if the coefficient of friction increases, will the force of friction increase or decrease?

increase

Explanation:

Force of friction is directly proportional to coefficient of friction, therefore an increase in the coefficient of friction will also lead to an increase in the force of friction

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.