7. Pull Push

10. 19381938 Both Pull 5 7 11 2 6 10 12 4

13. definition Balanced Force picture Unbalanced Force picture

24. Procedure 1. Color and cut out dragon racer. DO NOT CUT ON THE DOTTED LINE! 2. Create the ramp with the clothespins and ruler, as shown above. 3. Put a testing surface at the bottom of the ramp. Predict how far in centimeters the dragon will travel on your recording sheet. Set the dragon racer on this surface at the bottom of the ramp. Roll the marble down the ramp. Measure how far in centimeters the dragon racer went. Record. Repeat two more times.

25. 4. Repeat step 3 with a different testing surface until all testing surfaces are used. 5. Discuss findings as a class to explain friction. 6. Using the knowledge gained from the exploration, predict how far in centimeters the dragon racer will go on the real world surfaces. Record predictions. 7. Place your ramp on one of the real world surfaces with your dragon racer at the bottom. Roll the marble down the ramp into the dragon racer. Measure how far in centimeters the dragon racer went. Record. Repeat two more times. 8. Repeat step 7 until all the real world surfaces are used. 9. Complete discussion questions on recording sheet.

36. QUESTION (“What would happen if...”) HYPOTHESIS PROCEDURE Identify variable group and control group Trial 1Trial 2Trial 3 RESULTS CONCLUSION