Newtons Laws of Motion:
Authors note: I am writing this for one of my tasks.
Newton's laws. I think that everyone in this grade has at least heard this phrase. You may have just heard this phrase and not know what it means. Newton made a bunch of theories and some examples are "Newton's laws of gravity" or "Newtons 3rd law". Today I will be teaching you of the 3 laws of motion.
Newton's first law of motion states that an object will keep doing what it is doing until an unbalanced object interferes. So basically if an unbalanced object doesn't interfere then the object will keep moving. For example if a car is driving down the road and it hits a wall the car will stop moving. In this example the car is the moving object (obviously) and the wall is the unbalanced object. So now that you understand the first law we will move on to the second.
Newtons second law states that acceleration is made when force pushes an object (,the greater the mass the more force needed). To find the force on an object you must use this equation: F=m a. If you didn't get that then what it said was Force is equal to the mass of an object times its acceleration. So if a ball with a mass of 0.5 lb.s is thrown at a speed of let's say 46 mph, how much force would it have? If you did your math right you should get 23 lb.s of force. We have finished the second law and it is finally time to move on to the final one.
The third law states that For every action there is an equal and opposite re-action. to understand this we will look at a rocket (uh-oh).Calm down this is just rocket science! A rockets "Action is to push down onto the ground. The "Re-action" is it flying up in the air with equal force.
Now I have two major things that effect motion. "Gravity" and "Friction". As we all know Gravity is the downward force that pulls objects toward Earth and Friction is the energy created when two objects rub together. So why do these things effect motion? Its almost like I already told you the answer. Friction is the main thing. If an object is flying through the air it is already experiencing friction from the air around it. Then we have gravity that is pulling the object down. So if you have a model rocket and you launch it sideways (seriously don't try this this is just an example) it will eventually run out of fuel and fall to the ground. But if you took out the factor of gravity the rocket would go for about a mile before stopping. And if you took out friction the rocket would accelerate a lot faster and still go pretty far. So for an object in motion we can conclude that gravity and friction aren't its best friend. Also before I finish this paragraph I have an interesting fact for you; The reason that meteors burn up in the atmosphere is because the gravity pulls on it and as it is falling there is so much friction with the air and other gasses that it starts on fire!
Well we are finally done with the laws of motion and all that friction and stuff. Now I know that everyone has heard of Newton's laws. If they still haven't then they are probably younger than ten (no offense). Remember that there are more than just these 3 laws so if you are trying to find a topic to write about then go ahead and research them I'm not stopping you.
Sources:
"Newton's 3 Laws of Motion." CEEE GirlTECH Home Page. N.p., n.d. Web. 18 Jan. 2011. <http://teachertech.rice.edu/Participants/louviere/Newton/index.html>.
