We continued to work on using a force to set an object in motion.  Today we worked on using a pull to move the object.  We used a water bottle on the edge of the desk and then we attached a cup and added washers until we had enough pull force to move the water bottle.  Then we added mass to the bottle and saw that is required more washers to move the bottle.  We did this two times.  Each time the amount of washers increased as the mass of the object increased.  We concluded that as the mass of the object increased the pull force needed to set it in motion also needed to increase.