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# Newton's Three Laws of Motion - 6th Grade

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## Connie Yordy

on 10 April 2013

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#### Transcript of Newton's Three Laws of Motion - 6th Grade

Newton's Three Laws of Motion
6th Grade Aristotle was a Greek mathematician and philospher that lived from 384 BC to 322 BC. He thought a lot about a lot of things, and was one of the first scientists to write about laws of motion. http://www.wisc-online.com/Objects/ViewObject.aspx?ID=tp1202 A scientific law is a statement that describes events or relationships that exist nature.
A scientific law describes something that will happen the same way every time. Galileo Galilei proved that when dropped, objects with different masses will hit the ground at the same time.
(As long as there is no air resistance.) He thought about the mass of objects and how they behaved. He theorized that when dropped from the same height, objects with more mass would hit the ground first. Was he correct? Galileo's Experiment Recreated Galileo proposed that if a heavy object and a feather were dropped at the same time where there was no air resistance ( in a vacuum),they would hit at the same time. Newton's First Law of Motion Air resistance is the friction from air particles hitting an object as the object moves through the air. The faster the object goes, the more air particles it collides with and the greater the air resistance. It would not be possible for you to walk, or run, or ride a bike, or move on a skateboard without friction. Friction turns motion energy into thermal energy. That's why a match lights when scraped across a rough surface. Friction also causes tires on cars to wear out. Circular Motion
A satellite in orbit around the Earth stays in orbit because of a combination of gravity and inertia. If I were to put a tennis ball in a sock, then swing it in a circular motion, it would stay in a path around my head as long as I was holding it. Think about Newton's First Law. What would happen if I let it go? There are approximately 2,500 satellites in orbit today.
The first satellite, called Sputnik 1, was launched by the Soviet Union on October 4, 1958. It was the about the size of a basketball. It transmitted a signal for 21 days.
The first American satellite, Explorer 1, was launched three months later. http://www.classbraingames.com/2010/02/comets-hidden-word-search/ http://teachertech.rice.edu/Participants/louviere/Newton/law2.html Newton's Second Law of Motion You have to push or pull harder to move an object with a greater mass than one with less mass. The greater the mass of an object, the greater its inertia and the more force you need to move it. The 2nd Law of Motion can be written as an equation.

force = mass x acceleration force = mass x acceleration http://www2.franciscan.edu/academic/mathsci/mathscienceintegation/MathScienceIntegation-856.htm Newton's 2nd Law also states that objects accelerate in the direction of the force acts on them. Guess which way the car is going to go..... http://www.bitesizephysics.com/Resources/N's%203rd.pdf Newton's Third Law of Motion Suppose you are an astronaut making a spacewalk outside the shuttle. You fire your jetpack to go back to the shuttle, but nothing happens. You've run out of fuel and there is nothing close enough to push against.
What do you do?
Hint - Think about the tennis balls and Newton's Third Law of Motion. Every action has an equal and opposite reaction. All forces come in pairs.