grunigenjohn's Channel - YouTube

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5 months ago

Fun Science Experiments : How to Build a Catapult

Building a catapult is simple, using a block of wood as a base, a plastic spoon as the arm, two push pins and a rubber band as the torsion energy. ...

expertvillage • 69,030 views

grunigenjohn commented:

that was to dogn5

About grunigenjohn's channel

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grunigenjohn

Latest Activity

Oct 11, 2011

Date Joined

Jun 1, 2011

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Age

21

Country

United States

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