1. Template provided by: “posters4research.com” What is density? *Density is defined in a way as the measure of an objects heaviness to a constant size. *Our golf ball, for example, is heavier than the plastic golf ball of the same size. What is mass? *The thing that makes an object to have weight in a gravitational field. *Our rock has more mass than the ping pong ball. Why does density and mass push water from a cup? An object has a gravitational force because of it’s mass and density so it pushes against the water when it is dropped into the cup. The water also has mass and density so it pushes back. The difference between the two forces causes the water to spill over or makes the other object float. The question at hand is whether an object’s density causes water to displace when the object is added to a cup of water. The research will try to show how an object reacts by sinking or floating. We can then measure to find any lost amount of water. My hypothesis is that the heavier the object the more water will spill over the sides of the cup. I will attempt to prove my idea by measuring the weight of a cup of water before and after an object is dropped into the cup. I believe the different weights of the remaining water will be because of the different densities of the objects. In the four test trials all variables will be the same except for the four objects used. The objects are a ping pong ball, a plastic golf ball, a real golf ball, and a rock. The amount of water in the cup will be the same for all trials. For my hypothesis to be true the rock should spill the most water from the cup because it is the heaviest. IntroductionConclusions Selected References Proving the Hypothesis of Water Displacement Using the Density/Mass of Objects Charles B. Mohegan Elementary School Procedure *Record the weight of the object. *Record the weight of the measuring cup. *Record the weight of the measuring cup filled with water. *Place the measuring cup with water in the basin. *Hold the first object 1 inch above the measuring cup using the ruler as a guide. *Drop the object into the measuring cup. *Remove the object from the measuring cup. *Record the weight of the measuring cup and the remaining water. *Repeat the procedure for the other three objects. Methods Results *www.elmhurst.edu/~chm/vchembook/120Adensity. html *wordnetweb.princeton.edu/perl/webwn *http://www.fordhamprep.org/gcurran/sho/sho/skill s/h2odisskill.htm *http://www.newton.dep.anl.gov/askasci/phy99/phy 99x34.htm My conclusion is that my hypothesis as to an objects density and mass determining the amount of water displaced from a cup is correct. I conclude this because after the experiment was finished the results showed that the heavier objects spilled more water than the lighter objects. The rock was the most dense because it pushed 2.5 oz of water from the cup and the ping pong ball and plastic golf ball were the least dense because they did not push any water out of the cup and floated. The reason this happened is that the water pushing against the ping pong ball has more density so pushes harder than the ping pong ball can so the ping pong ball can only float. When the rock pushes against the water the rock will sink and push the water out of the cup because it has more density so it has a bigger force of gravity. So now we know that the denser an object is the more water it will displace out of a cup. For Further Information Charlie B. Mohegan School Room 121- Ms. Catone Theoretical Rationale Materials water 1 ping pong ball 1 plastic golf ball 1 golf ball 1 large rock 1 small basin 1c measuring cup 1 scale 1 ruler Graph 1 Test Results of Water Displacement Trials Vertical Bar Chart Graph 2 Test Results of Water Displacement Trials Horizontal Bar Chart Results