You will need: Empty tissue box, three pencils (preferably unsharpened), rubber bands, hole puncher, a plastic cap, a pipe cleaner, scissors, duct tape, marshmallows, decorating supplies if desired.
Use a combination of simple machines to build a catapult. Use a combination of simple machines, a lever, and an axle to build a catapult, and then use the catapult to conduct a simple investigation ...
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