Newton’s Laws

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A brief description and explanation of Newton's 3 laws of motion and how they are applied to real life.

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Newton’s Laws

  1. 1. Newton’s Laws Mika Lim Period E 3 . 24 . 13
  2. 2. Newton’s 1st Law An object at rest or an object in motion will stay at rest or in motion unless acted on by an unbalanced outside force.  All objects resist motion change – inertia  The greater the mass of an object, the more inertia it has
  3. 3. Examples 1.) You roll a bowling ball down an alley. Its keeps on rolling and rolling at constant speed until it hits a pin. From there it slows down. This is an example of Newton’s 1st law as it illustrates the fact that an object in motion will stay in constant motion unless acted on by an outside force. In this case, the pins were the outside force 2.) There is a glass on a table. It sits completely still, undisturbed. It will continue to be still unless someone or something comes by and disturbs it. This is an example of Newton’s 1st law because the glass would have stayed stationery, had it not been for an outside force. An example of such force is an animal knocking it over or a person picking it up.
  4. 4. Newton’s 2nd Law A force of an object is equal to its mass multiplied by its acceleration.  Change in motion only occurs if a net force is exerted on an object  The more inertia an object has, the harder it is to accelerate  More mass is equal to less acceleration if the acting force is the same
  5. 5. Examples 1.) Your car, which weighs 1,670 kg, is out of gas. You start to push it at a speed of 0.05 m/s/s to the gas station. The force you’re pushing it with is its mass multiplied its acceleration, according to Newton’s law. 1,670 kg multiplied by 0.05 m/s/s is equal to 83.5 newtons. Therefore, the force exerted on your car is 83.5 newtons. 2.) You are pushing an empty shopping cart while the person next to you is pushing a full one. You make eye contact and decide to race each other. Both of you are exerting the same strength of force on the carts. However, you are going faster than she is. This is because Newton’s 2nd law states that more mass is equal to less acceleration if the acting force is the same.
  6. 6. Newton’s 3rd Law For every action, there is an equal and opposite reaction.  The force exerted by the first object is called the action force  The force exerted by the second object is called the reaction force
  7. 7. Examples 1.) Imagine a flying bird, its wings pushing air downward. Since forces result from mutual interactions, the air must also be pushing the bird upwards. The size of the force on the air equals the size of the force on the bird. The direction of the force on the air is opposite the direction of the force on the bird. Action- reaction force pairs make it possible for birds to fly. 2.) If it were not for the reaction force, we would be unable to walk. As we walk, we push onto the ground with our feet. As we push down, earth pushes back up on us. This is true to Newton’s 3rd law because the action of placing our feet on the ground is coupled with an equal, opposite reaction from earth. If the earth did not push back, we would sink.
  8. 8. Bibliography  http://katiejaynenorman.blogspot.com/2012/01/how-to-knock- down-last-bowling-pin.html  http://us.cdn4.123rf.com/168nwm/hjillchen/hjillchen1211/hjillch en121100147/16330378-dirty-table-top-with-knocked-over- glass-of-milk-large-messy-puddle-of-milk.jpg  http://strongmuscleproject.files.wordpress.com/2012/10/car- push.jpg  https://encrypted- tbn0.gstatic.com/images?q=tbn:ANd9GcQFqtnW-oIeIEqgFJJ- DXaEd4uAsXNmx_5jeQMmdnE2NaMCg2YqjsAgXg17  http://www.photographyblogger.net/wp- content/uploads/2010/08/birds3.jpg  https://encrypted- tbn1.gstatic.com/images?q=tbn:ANd9GcSEoQl_1tL5Oj4yEQrQk R0G_eW4EAWJh20uNcif5xHUf-F3ET1a

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