Catapult

Catapult

Aim: To calculate the speed.

What we want to happen: 

• We want to be able to make a catapult.
• Calculate the speed it is flying at.
• Have a competition who can make the best one.
• Whos can go the farthest and fastest.
• Who can catch the most marshmallows in their mouth

Equipment:
Creates one catapult

• Popsicle sticks (Around 10)
• Rubber bands (Around 5)
• Plastic bottle cap (1)
• Something to catapult Eg: Small stone, Marshmallow (As many as you want)
• Hot glue
• Plastic cups (4)

Method:

We didn't make it exactly like this but it was similar.
Results:

Marshmallow (Amount)	Test 1	Test 2
1	2m28cm	3m
2	2m11cm	2m
3	1m71cm	1m22cm
4	1m40cm	1m23cm

Test 1: In this chart, you can see the blue line which represents how many marshmallows are used, and the red line is the distance of how far the marshmallows went. As you can see from this chart the distance of the marshmallow decreases as the number of marshmallow increases.

Test 2: In this chart, you can see the blue line which represents how many marshmallows are used, and the red line is the distance of how far the marshmallows went. As you can see from this chart the distance of the marshmallow decreases as the number of marshmallow increases, but unlike test 1 the distance decreased faster and then stays at the same distance and then at the end, it goes up a little bit.

Photos: