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Newton’s Laws of Motion

Newton’s Laws of Motion. By: Liz Munsey. Sir Isaac Newton. Sir Isaac Newton was born in 1643 and was one of the most influential scientists of all times. He is most famous for describing universal gravitation and coming up with his three laws of motion. He died in 1727. Galileo.

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Newton’s Laws of Motion

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  1. Newton’s Laws of Motion

    By: Liz Munsey
  2. Sir Isaac Newton Sir Isaac Newton was born in 1643 and was one of the most influential scientists of all times. He is most famous for describing universal gravitation and coming up with his three laws of motion. He died in 1727.
  3. Galileo Galileo Galilei was an Italian physicist who lived before Newton and determined that all objects fall at the same rate regardless of mass.
  4. Newton’s First Law of Motion In the absence of force, a body is either at rest or moves in a straight line at constant speed. In other words, an object in motion stays in motion and an object at rest stays at rest.
  5. Newton’s Second Law of Motion A body experiencing a force F experiences an acceleration a related to F by F = ma, where m is the mass of the body. Alternatively, force is proportional to the time derivative of momentum. Basically, the force an object has is its mass times its acceleration.
  6. Newton’s Third Law of Motion Whenever a first body exerts a force F on a second body, the second body exerts a force –F on the first body. F and –F are equal in force and opposite in direction. Or, for every force applied to an object there is an equal force in the opposite direction.
  7. Example of Newton’s First Law The picture originally moved and it may or may not, but if the little person is riding in the car without a seatbelt and the car hits the wall, the car will be stopped but the person will continue to go forward as an object in motion will stay in motion unless it is stopped by something. The car was stopped by the wall, but the person will not be stopped.
  8. Example of Newton’s Second Law That’s not the best picture and it better illustrates a different set up of the formula F = ma, which can also be set up as F/m = a. Or, a force divided by the mass equals acceleration. I couldn’t find a picture for F = ma.
  9. Example of Newton’s Third Law This picture shows that for every action, there is a reaction in the opposite direction. For every action there is an equal opposite reaction. When those forces are not in balance, there is a movement in a specific direction, like in the picture.
  10. Activities For the First Law, this could be demonstrated by doing the trick of pulling the tablecloth off of a table with a bunch of dishes on it. Because the force is only applied to the tablecloth, the dishes will stay in place. For the Second Law, you could apply various amounts of force to objects of different masses and measure acceleration to illustrate the formula. And for the Third Law, you could lean on a wall and that would illustrate that the wall pushes back on whoever is leaning on the wall with an equal force so neither falls over.
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