Q1. how does friction affect the mechanical energy of a system? q 2. a roller coaster is at the stop of a hill and rolls to the top of a lower hill. if mechanical energy is constant, then on the top of which hill is the kinetic energy from the roller coaster motion greater?

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.