Dave-mike

we think that the dollar coin will be more dangerous then the penny because the dollar coin has more mass then the penny.

Nice persistence. Did you get any pics of the indentations in the styrofoam? (It's not a big deal if you didn't.)

we will drop the coins from the stairway onto the styrofoam. we will look to see if the dollar coin makes a bigger indent and we will watch on the video camera.

The dollar coin made a larger indent on the Styrofoam, than the penny. It took many attempts as it was hard to aim, but we finally hit the Styrofoam after about 3 attempts. So therefore our hypothesis was right, the larger coin made a bigger indent, not much but a noticeable difference.