Force and Motion

Topics: Newton's laws of motion, Classical mechanics, Inertia Pages: 11 (1507 words) Published: December 6, 2009


Ronald Steven DuBois

5th Grade

St. Michael's Catholic School



1. Abstract

2. Introduction

3. Background Information

4. Procedure

6. Data and Observations

7. Results

8. Conclusion

9. Bibliography


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.



Materials :

1. Catapult

2. Spray Paint

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