![]() Now we can use Equations 8 and 10 to plot the motion of a projectile in the (x,y) plane. Projectile motion refers to the method used for calculating the trajectory of a projectile (which can be pretty much any physical object - a rock, a ball, etc.) as it moves through the air. Predicting the trajectory of a ball launched from the catapult requires an understanding of two fundamental physics concepts: projectile motion and conservation of energy. Part of the scientific process involves figuring out what those factors are so you can make better predictions next time. ![]() There are many real-world factors that can be difficult to account for in predictions. If the results match, you can conclude that your predictions and the assumptions you used to make them were valid under the circumstances of the test. You can also use physics to predict the trajectory of the ball, and then compare this predicted trajectory to the one you measure from video recordings. ![]() Well, it is a lot more fun if you actually get to use a catapult instead of just doing the calculations! In this science project, you will use a catapult to launch ping-pong balls and use a video camera to film their trajectory, or path, as they fly through the air. You have probably seen figures in your physics textbook that show a catapult launching a projectile and then equations that calculate the resulting trajectory.
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