Marble Cannon

Gather Supplies

• 50cm x 50cm wood board
• 45cm PVC pipe
• 18cm PVC pipe
• 45cm wooden dowel rod
• 2 springs
• Hose clamp
• 2 tube straps
• 3 25cm tall wood blocks
• 2 hooks

Step 1:

• Connect the 3 wood blocks to the wooden base using wood glue and screws.

Step 2:

• Using the tube straps, drill the short PVC pipe into place loose enough to spin on top of the wood blocks.

Step 3:

• Using another strap, drill the long PVC pipe onto the small one so that the angle of the cannon can change.

Step 4:

• Drill a hole at the end of the wooden dowel and put in a metal rod through it.
• Add nuts to hold the metal rod in place as well as connect one end of each spring to the wooden dowel.

Step 5:

• Use a hose clamp to connect hooks and springs to the PVC pipe.

Step 6:

• All done!

Step 7:

The calculations show

• Time launch took
• Initial velocity using kinematic equations
• Force using work-energy equations