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Newtons Laws

By onionater Jun 02, 2012 667 Words
Newton’s I, II, & III Law

Newton’s three laws of motion explain everything that happens to objects in Earth. Anything from kicking a ball to a human being walking is explained by Newton’s three laws of motion. They explain something different of the motion of an object, put together they explain everything. In order they are; Newton’s First Law: The law of inertia; Newton’s Second Law: The law with the concept of acceleration; Newton’s Third Law: The Law of Action & Reaction.

Newton’s 1st law states that any object at rest will remain at rest or if its moving it will remain moving at a constant speed until force is has acted upon it or is exerted on it. For example, a ball will remain at rest until a force acts upon it. Yet, it will keep going at a constant speed unless another force overpowers it. When a force is applied it doesn’t necessarily have to be one force, it can be multiple. Those forces could include gravity, friction, and your own. In order for this law to be applied to an object, it must be in equilibrium. An object is only equilibrium if the vector sum of all forces equals zero. With these forces & objects also experience acceleration explaining the connection with the two laws.

In addition, Newton’s Second Law states that forces acting upon an object go through acceleration. Acceleration is a change in velocity or speed. For example, a ball going down on an inclined plane will go through certain acceleration. It will usually keep gaining speed during each time interval. However, an object will not accelerate forever, the faster an object goes the less it acceleration it has. When its acceleration reaches zero it has reached its terminal velocity. Generally, the heavier an object is the harder it is to get it to accelerate. The bigger the mass, the more force is required to accelerate. Also, an object’s acceleration could be affected by friction and air drag. Air drag applies to all objects even if it’s in free fall or not, making it go through the previous two laws. Acceleration modifies inertia, yet friction affects acceleration. It being like a cycle the objects general process goes through Newton’s Third Law of Motion: The Law of Action & Reaction.

Furthermore, Newton’s third law states that whenever a force is exerted on an object the object will also exert an equal opposite force back. For example, when you punch a wall it hurts your knuckles as much as it hurts the wall. The stronger or softer you hit the wall, the stronger or softer it will hurt you. This law of motion states that you can’t touch without being touched. In other words everything you do towards another object will do the same back. In some cases, the consequences are different. For Instance, a bug is flying down the road and a car’s windshield squishes it. The car hit the bug as well as the bug hit back whereas the car had more mass overpowering the bug’s mass making the bug lose the “battle”.

In conclusion, with Newton’s First law I learned that an object will remain at rest or if in motion will remain at motion. In order for an object to move or stop a force needs to act upon it. This is where Newton’s Second law comes in. With that force it causes the object to accelerate or decelerate making it move or stop moving from the original velocity. Then friction comes to the equation making it impossible to accelerate infinitely. With friction an object reaches a terminal velocity proving that for every action there is a reaction. The object accelerates yet stops accelerating at terminal velocity it being the reaction. This proves why Newton’s three simple laws explain everything that happens to an object in Earth. Also, it explains why they go together. Each one overpowers one another yet its impossible for one to act without the others.

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