Crazy+catapults!

= Will a ligh **t ball or a heavy ball go the furthest distance when fired from a catapult?** =

By Marcus and Sean = __Task 1: Answer these questions__  = __ 1. How does a catapult work? __

It works by throwing cannon balls at the enemy. Catapults work by storing tension in either twisted ropes or a bent piece of wood in the same way that an archery bow does. Catapults store and release energy. They have a bow mounted frame slider which holds the bow string. The slider is moved by a claw trigger.

__ 2. What are the parts of a catapult and how do they make it work? __ __ Who made the first catapult? __

Writings that have been found in China suggest that the first catapult was invented either in China or in the Middle East around about the 3rd or 4th Century BC. But before massive catapults there was the crossbow and the slingshot which are both mini versions of the catapult.

__ What doe the words launch angle, pull-back angle and trajectory mean? __ __Launch__ means to fire at something or something that means go! __Pull-back__ means the act of pulling back, or stretching back rope, string or wood to increase the amount of tension and force __Trajectory__ means the path an object follows when its moving through space

__Task 2: List your independent, dependent and controlled variables:__
__1. Independent variable: weight__

__2. Dependent variable: How far (distance)__

__3. Controlled variables:catapult,power__

=  __Task 3: What is the hypothesis for your experiment?__  = __The ping pong ball will go furtherist. If it doesn't we'll change the ball to the one of the other__

=  __Task 4: What equipment do you need for your experiment?__  = 3x ping-pong ball - 1 normal ping pong ball, 1 pingpong ball filled with sand, 1 ping pong ball filled with water 1x mini catapult 1x screwdriver scales to weigh the ping pong balls 1 x stickytape =  __Task 5: List all steps in the method of your experiment (try and include a diagram or video that helps explain):__  = 1. make a mini catapult 2.drill a hole into two ping-pong balls and one hole-less 3.fill one of the ping-pong balls with water and the other one with sand.(Leave the hole-less ping-pong ball hole-less and forget to tape them shut when full) 4.now this is the time to have fun. bring out the catapult and put the water ping-pong ball into the sling. measure how far the ball goes. Do the same with the others __**Task 6: Observation and discussion**__

Note down what you noticed as you did each experiment. Try and include an image or a video or photos of your experiment.

__Experiment 1 Observations:__

__Experiment 2 Observations:__

__Experiment 3 Observations:__

= __Task 7: Results__  =

Take a screen shot of your results table. Upload it and put it here:

__Task 8: Conclusion__
Write a statement that says whether your hypothesis was wrong. If you were wrong, why were you wrong?