Extra: Test what happens if you move the stack of six sticks closer to the launching cup or in the other direction.Do you get similar results each time? Is what you observe what you expected? Can you explain why? Did you notice in which case you needed to do the most work? Is it when you pushed down a little or when you pushed down farther?.It all happens fast! Does your ball fly higher or lower? Does it land farther or nearer when you push down a lot compared with when you push down a little? You might need to repeat the test a few times to make your observations. Perform a test: Put your cotton ball in the cup, push the cup down farther, release and observe.What do you expect will happen when you push the cup farther down? Will this make it fly higher, farther, both higher and farther or take the same path but maybe faster?.What happened to the ball? Did it fly? Did it go high or low? Where did it land?.Place a cotton ball in the launching cup, push the cup down just a little bit and let go.Clear about a meter of open space for the launched object (the missile) to fly and land. Put your catapult in an open area with a sturdy, flat surface such as a table or an open space on a hard floor.Put your catapult on its base, locate the end of the launching stick that sticks up and glue the bottle cap there so it forms a small cup to hold the missile.Now the launching stick and the base form a V shape lying on its side with the stack of sticks in the middle. If it were not for the stack of sticks in between, the launching stick would fall flat on top of the base. Next, add the base by attaching a stick to one end of the launching stick with a rubber band.If you cross it this way, the sticks will stay nicely perpendicular. You can do this with one or two rubber bands that are crossed in an X over the sticks.
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