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How The 3 Laws Of Motion Affect Life Today

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How The 3 Laws Of Motion Affect Life Today

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These three laws of motion proposed by Isaac Newton are still taught today as some of the main cornerstones upon which the field of physics is based. From the laws of motion, Newton went on to discuss the idea of gravitational pull, how it relates to the solar system, and much more. He talked about comets and how they move through orbit and how the sun’s gravity affects the entire solar system. Newton described how the moon’s gravitational pull at various times throughout its cycle affects the ocean tides and how the sun’s gravity caused the Earth to flatten near the poles while it bulges near the equator. These are all ideas that are still prominent and taught in physics classes today.

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Sir Isaac Newton died on March 20, 1727. He died at the age of 84. He was buried at the famous Westminster Abbey. Sir Isaac Newton will be remembered as a brilliant man whose work in math and science will continue to help schools teach students today.

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Sir Isaac Newton was born on January 4, 1643 on a calendar that we use today. On a "old" Julien calendar, he was born on December 25, 1642. He was born to Isaac Newton Sr. and Hannah Ayscough Newton. His father died 3 months before he was born. He mother remarried when he was 3 and she went to live with him leaving Isaac to his grandma to take care of him.

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Isaac Newton was knighted by Queen Anne of England in 1705. By that time, he had already been elected president of the Royal Society. Both of these events evidence how Newton had increasingly been put in the spotlight as a public figure later in his life

At the time of his knighting, Isaac Newton had essentially given up his career in science to be a politician, and by his death, he was widely known throughout the European continent.

His greatest contribution to science was his theory of gravity. In "Mathematical Principles of Natural Philosophy," Newton describes the force of gravity and how it acts on objects. He also essentially started the field of optics with his work on light.

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Newton was elected for Parliament, he ran and earned a seat. He only served one year

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SoftSchools.com

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His most famous achievements were the 3 laws of motion. Some others are the reflecting telescope, and the theory of calculus. Also the 3 books of Principia.

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http://teachertech.rice.edu/Participants/louviere/Newton/law2.html

http://teachertech.rice.edu/Participants/louviere/Newton/law3.html

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According to Newton's first law...

An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

This law is often called
"the law of inertia".

What does this mean?

This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.

Let's study the "skater" to understand this a little better.

What is the motion in this picture?

What is the unbalanced force in this picture?

What happened to the skater in this picture?

This law is the same reason why you should always wear your seatbelt.

Now that you understand
Newton's First Law of Motion,
let's go on to his Second Law of Motion.

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According to Newton's first law... This law is often called "the law of inertia". This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.

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In 1684, a scientist urges Newton to write about how an a planet moves in a certain orbit. His work turns into a 3-volume book known as Principia. Published in 1687, this work details the 3 laws of motion and the law of universal gravitation.

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After he graduated Cambridge, he built an improved version of the reflecting telescope. His friend, Dr.Barrow, took it to the Royal Society of London, the country's most famous scientific society. They liked his design so much, they invited him into his group.

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There was this fellow in England named Sir Isaac Newton. A little bit stuffy, bad hair, but quite an intelligent guy. He worked on developing calculus and physics at the same time. During his work, he came up with the three basic ideas that are applied to the physics of most motion (NOT modern physics). The ideas have been tested and verified so many times over the years, that scientists now call them Newton's Three Laws of Motion.

The first law says that an object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed. Motion (or lack of motion) cannot change without an unbalanced force acting. If nothing is happening to you, and nothing does happen, you will never go anywhere. If you're going in a specific direction, unless something happens to you, you will always go in that direction. Forever.

You can see good examples of this idea when you see video footage of astronauts. Have you ever noticed that their tools float? They can just place them in space and they stay in one place. There is no interfering force to cause this situation to change. The same is true when they throw objects for the camera. Those objects move in a straight line. If they threw something when doing a spacewalk, that object would continue moving in the same direction and with the same speed unless interfered with; for example, if a planet's gravity pulled on it (Note: This is a really really simple way of descibing a big idea. You will learn all the real details - and math - when you start taking more advanced classes in physics.).

The second law says that the acceleration of an object produced by a net (total) applied force is directly related to the magnitude of the force, the same direction as the force, and inversely related to the mass of the object (inverse is a value that is one over another number... the inverse of 2 is 1/2). The second law shows that if you exert the same force on two objects of different mass, you will get different accelerations (changes in motion). The effect (acceleration) on the smaller mass will be greater (more noticeable). The effect of a 10 newton force on a baseball would be much greater than that same force acting on a truck. The difference in effect (acceleration) is entirely due to the difference in their masses.

The third law says that for every action (force) there is an equal and opposite reaction (force). Forces are found in pairs. Think about the time you sit in a chair. Your body exerts a force downward and that chair needs to exert an equal force upward or the chair will collapse. It's an issue of symmetry. Acting forces encounter other forces in the opposite direction. There's also the example of shooting a cannonball. When the cannonball is fired through the air (by the explosion), the cannon is pushed backward. The force pushing the ball out was equal to the force pushing the cannon back, but the effect on the cannon is less noticeable because it has a much larger mass. That example is similar to the kick when a gun fires a bullet forward.

Or search the sites for a specific topic.

Newton's Laws Aboard The ISS (NASA-eClips Video)

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Physics4Kids.com: Motion: Laws of Motion

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There was this fellow in England named Sir Isaac Newton. A little bit stuffy, bad hair, but quite an intelligent guy. He worked on developing calculus and physics at the same time. During his work, he came up with the three basic ideas that are applied to the physics of most motion (NOT modern physics).

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At the age 5,  Newton attended the village's school. At 11, he starting a attending a school seven miles away called King's School in Grantham. At King's, he got bullied and he fought back. Newton won and then he decided to be better than all of the other students and he fulfilled that. Then he dropped back, worked his back up to the top, dropped back, back up and did until he was 16. Then, his mom took him out of King's to learn how to farm but Newton wanted to go to college and study so he enrolled to Trinity College at Cambridge. Cambridge got closed for a year in 1666 due to the Black Plague. When it reopened in 1667, Newton returned and continued studying. He became a professor in mathematics.