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Objective: To construct a catapult or series of catapults in order to test an

experimental variable.Core Question: How is the experimental variable accounted for?

Drill: 1. Look at your procedures. 2. In your Log Book create a list of

materials that you will need for construction.

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Procedure Checklist1. Be specific.2. Start each step with an action verb.3. Include diagrams when necessary.4. Include 1 main idea per step.5. Stay on topic.6. Number steps.7. Steps should be logically ordered.8. No personal pronouns should be

used.

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Sample Procedures1. Cut the top part of the juice carton off so that

each of the 4 walls is 19 cm high. See Figure 1.2. Cut downward along each front edge 15 cm and

fold the flap down.3. Remove this piece by cutting horizontally along

the fold of the flap.4. Place a mark on the short surface of the carton

centered about 4.7 cm from each side and about 2 cm from the bottom.

5. Use a nail or scissors to punch a hole about 0.5 cm in diameter at the mark on the bottom of the carton.

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Sample Procedures6. Place a mark on each side of the carton centered

from front to back 14 cm up.7. Place a mark on each side of the carton 4cm from the

back and 4 cm up.8. Using a sharp pencil, punch holes on each mark.9. Insert a pencil through each set of parallel holes in

the sides of the carton connecting the sides so that an equal amount extends outward from each side. The top pencil is the fulcrum bar. The bottom pencil is the tension enhancer.

10.Cut a 2 cm strip off the top of each side leaving a 2 cm upward extension on the front of the carton.

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Sample Procedures11. Fold this extension downward so that it lies

horizontally. (It should be even with the sides.) 12. Tape the top flap down.13.Insert a rubber band through the front hole, so that

only a small loop hangs out.14. Slide a craft stick through the hole, and pull the

rubber band tight from the inside.15. Thread the free end of the rubber band through the

hole in the end of the spoon, and loop it over the end.16. Pull the rubber band around both of the pencils so

that it faces the inside of the container. You may need to temporarily slide the pencils out to allow the spoon to pass.

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Group Work

REVISE YOUR PROCEDURES AND START CONSTRUCTION.

Remember to account for your experimental variable.

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HOMEWORK

Work on prototypes if necessary.