1. What can be done to increase the friction the friction between two objects?
a. make the surface of one object smoother
b. put water in between two objects
c. increase the force pressing the two objects together
d. decrease the force pressing the two objects together

2. Which is NOT true about gravity?
a. Gravity is not a force
b. Gravity works different objects
c. Gravity is the same as the value of an object’s weight
d. Gravity is the same whether objects are near or far from each other