Answer:
Coefficient of friction.
Explanation:
The amount of friction divided by the weight of an object is equal to the coefficient of friction. It is a dimensional less number. It can be given by :

N is normal force.
= coefficient of friction

Answer:
10 newtons, because the gravitaional force willbe stronger the closer it gets.
The experimenting stage, since the scientist would need to record his or her data on a chart