Also when making the catapult, i realized that you can use kinematic equations to find out any of the variables. Because the catapult produces a projectile, you can use horizontal and vertical equations to solve and find velocity, distance, time, or acceleration. I think its very interseting that by having just three variables you can solve for any of the five. When launching the catapult, we will have the distance and time and we can make some assumptions for the third variable. So we can find the velocity.
Overall i think the catapult was a good way to be able to build something and see how physics is really involved.
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