2.  How does hill height effect velocity?  How does loop size effect velocity?  How does mass effect velocity?  How does the number of loops effect velocity?  How does the number of hills effect velocity?  How do the number of curves effect velocity?  ** Write your own question to investigate**

3.  Example: How Does Hill Height Effect Velocity?  Make three roller coasters. One with a small hill, one with a medium hill, one with a large hill. Measure the height of the each hill in cm. Record it in your notebook. Draw pictures and label them.  Calculate the speed of your marble on each coaster. Test each coaster at least three times. Record the speed in cm/s. You need distance of the track, and time in seconds.  Record your data in a table. Make sure you only change the height of the hills. Use the same marble, and the same basic roller coaster design. CoasterTrial 1Trial 2Trial 3Average Small 10cm cm/s Medium 20cm Large 30cm

4.  Example: How Do the number of loops effect velocity?  Make three roller coasters. One with a single loop, one with a double loop, one with a triple loop. Keep the loop shapes the same.  Calculate the speed of your marble on each coaster. Test each coaster at least three times. Record the speed in cm/s. You need distance of the track, and time in seconds.  Record your data in a table. Make sure you only change the number of loops. Use the same marble, and the same basic roller coaster design. CoasterTrial 1Trial 2Trial 3Average 1 Loop 2 Loops 3 Loops

5.  Test your roller coasters.  Record the distance of your track.  Record the time in seconds it takes for your marble to get from start to finish.  Draw pictures of your coasters.  Write down all of your thoughts. What is happening? What is working? What isn’t?  Record hill heights, loop sizes, curves, the mass of your marbles.

6.  What is the answer to your question?  What can you say is probably true about friction and gravity effecting your marble’s motion?  What is effecting the velocity of your marble the most?  What data did you collect that supports your ideas?  Discuss how inertia effected the velocity of your marble.

7.  Create a poster to display your investigation. You need 4 parts to your poster. Question Methods Data Analyze

8.  Expo Rules You are either a Walker, or a Talker. You will do both, just not at the same time.  Walker: *Go to each poster. *Read each poster. *No talking, until you ask the ‘Talker’ a question. *Ask the ‘Talker’ one question about their data. *Record the answer to the question in your science notebook. *What was the answer to your question? *How can your investigation be improved? *What was the most surprising thing about your results? *If you were to do this again, what would you change?  Talker * It is your job to stand by your poster and answer questions from the walkers. * One person from your group only. * Take turns. Everyone in your group needs to take their turn as the talker.