FORCE AND MOTION
Ronald Steven DuBois
St. Michael's Catholic School
TABLE OF CONTENTS
3. Background Information
6. Data and Observations
I thought it would be fun to fling things like raw eggs and rocks with a catapult. Guess
what, it was! By flinging these items I tried to find out if heavier things would travel farther than
lighter ones. Basically how force effects motion.
With the catapult as the force, I sent items soaring, after weighing them, and then
recorded how far the items travelled. This showed me how Newtons Three Laws of Motion
Force causes change is Newton's First Law of Motion which I saw from the catapult
flinging the items.
My hypothesis that heavier items would go farther was not correct, because Newton's
Second Law of Motion says that the force applied is equal to mass times acceleration. For
instance, if you push a skateboard it will roll away, but if you push a car with the same amount
of force, it will barely move. So heavier items do not travel farther.
Newton's Third Law of Motion is that for every action there is an equal and opposite
reaction. In my experiements this is shown clearly by the graphs in my research paper where I
recorded the weight of the items I flung with the catapult, and then recorded the distance the
items traveled. So when I sent an item soaring gravity was pulling it down and acting as the
equal and opposite reaction.
I really had fun with this project and conducting the experiments.
I did my Science Fair Project on Force and Motion. I wanted to find out how far different
items would travel when given the same amount of force. Would the size of an item or the
weight of an item be more important? Would the shape of an item change anything? If I change
the amount of force but keep everything else the same, will I get the same result?
It is my hypothesis that heavier items will travel farther than lighter items no matter what
size it is. It is also my prediction that if the same amount of force is given to one group of items
and then you compare it with the same group of items, changing the amount of force on the
items, the results will be the same, the heavier items will still travel farther.
When I investigated about how to do an experiment that would show how force effects
motion I used the internet to Google, "Ways to show Force and Motion." Many pages came up
showing catapults. I showed these to my dad and he helped me build a catapult to represent
With a catapult I could pull back the arm to different places to show different amounts of
force. That way I could see if the amount of force would be the same on a group of items when
compared to the same group of items with a different amount of force.
When I looked up Force on the internet I learned that it meant
When I looked up Motion on the internet I learned that it meant
When I looked up force and motion I saw the name Sir Issac Newton a lot of times. So I
looked up Sir Issac Newton and found out that there were Three Laws of Motion. They are
Newton's First Law of Motion - force causes change
Newton's Second Law of Motion - force applied = mass x accelereation WHICH IS THE SAME AS - force applied = weight x speed
Newton's Third Law of Motion - for every action there is an equal and opposite reaction.
Sir Issac Newton also discovered gravity.
2. Spray Paint