When you build a catapult with three basic machines as component of the design (lever, pulley, screw), you add multiple levels of intricacy to an already elegantly conceived machine. Change trajectory, control trigger mechanism and also launch ping pong balls with an ext thoughtful plans than just point and release.
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We are accustomed to teaching with a model in prior of a child, however these instructions must make it so that anyone can develop one there is no our presence. We advice that parents and teachers be there to guide – but to enable the son to try to allow the materials (and a snapshot of the last product) overview them. A wrong direction is always un-doable till you"ve glued something.
The Parts. We use hardwood Glue yet White glue is well too.
Step 1. Making sure you have identified the top and bottom side of the base. Apply glue right into the notches because that the uprights and tap them right into them so that they stand level on the table when placed into the notches. It should look favor the second picture here.
Step 2. Hammer the nails right into the little holes in the bottoms of the uprights so the they room secure.
Step 3. ar two 1/4" dowels right into one of the uprights together shown and the 3rd dowel v the topmost hole in the "arm" the the catapult.
Step 4. connect the "arm" come the uprights by advertise the dowel with the bottom feet on the arm. Make sure the "arm" is walking in the ideal direction once you connect it. Look at the picture. Push the optimal dowel v the hole on the height of the other upright.
Step 5. connect one of the tan rubberbands come the dowel top top the topf of the uprights and bring it about the arm and onto the other side. (See the picture).
Step 6. carry the wire up and also around the pulley in the arm. (See the picture).
Step 7. then down, around and up approximately the wheel in the base. (See the picture).
Step 8. put the quick dowel with the feet on the trigger piece and also slide it right into the bottom that the base so the it can be moved down into the slot come secure it. (See the pictures).
Step 9. top top the top side, take it the small rubberband and attach it to the trigger and also thumbtack it to the side of the base. (See the pictures).
Step 10. push in and twist the screw eye to the tiny holes ~ above the front bottom of the catapult. (See the pictures). These help you collection the trajectory of her ping pong ball as soon as it"s launched.
Step 11. connect the wire to the trigger. (See the pictures).
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perfect Simple machine Catapult ready to beginning a ping pong ball. (See the picture.)
You have to wear eye protection whenever using a catapult. Be certain to shoot away from yourself, and also don"t put your face above the catapult once shooting it.