Purpose Apply and Analyze Newton S First and Third Laws of Motion

Purpose Apply and analyze Newton’s first and third laws of motion

Identify independent/dependent variables and constants

Materials small oblong balloon soda straw 2 meter sticks

fishing line protractor tape

Redesigning the Experiment (Again!)

Look back at the IVCDV chart completed in Part I. Rewrite all the constants in the middle column. Draw a circle around the constant you will test in Part III “Angle of the String” and draw an arrow from it to the independent variable column. Write “Angle of the String” in the space beneath the words independent variable. The three courses tested in Part III are horizontal, 45 °, and 90°. The dependent variable will be the same as in Part I. Then complete the V chart.

Independent Variable (IV) / Constants / Dependent Variable (DV)

Procedure Part III-Testing the Angle of the String

Switch roles within your group so that each group member has a different job than in part I or II.

Project Manager: 1. Select which course (horizontal, 90° and 45°) to test first.

Designer: 2. Set up the horizontal rocket test course by tying the end of the fishing line to the back of a student chair. Make sure there are two meters of space behind the chair for the test course. Set up the 90° and 45° courses according to teacher directions.

Engineer: 3. Thread the end of the string through the straw.

Launcher: 4. Blow up the balloon and hold the end of the balloon until step 8 is complete. Do not

tie the end of the balloon! The same balloon is used for all trials, so only the launcher will blow up the balloon.

Engineer: 5. Tape the balloon to the straw as shown in the diagram.

Project Manager: 6. Hold the end of the string taut.

Launcher: 7. Move the balloon rocket to the end of the string. When testing the 90° and

45° courses, the flight will begin at the floor.

Designer: 8. Make sure both ends of the string are at the proper location. When testing the horizontal course, both ends of the string should be level. Check the angle the string makes with the floor by using a protractor when testing the 90° and 45° courses.

Launcher: 9. Release the balloon while the project manager continues to hold the string taut and at the correct angle.

Designer: 10. Measure the distance on the horizontal course from the end of the string to the end of the balloon rocket. When testing the 90° and 45° courses, mark the distance traveled by pinching the string at the highest point of flight then measure the distance from that point to the floor.

Project Manager: 11. Record results in the data table.

Group Members: 12. Complete three trials of each course with your group.

Construct a bar graph illustrating the average results. Include an appropriate title for the graph and identify each bar.

Data Analysis: