PowerPoint Presentation Newton’s Laws of Motion


Some Examples from Real Life



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Mirzayeva H NewtonsLaws1

Some Examples from Real Life

  • Two teams are playing tug of war. They are both exerting equal force on the rope in opposite directions. This balanced force results in no change of motion.
  • A soccer ball is sitting at rest. It takes an unbalanced force of a kick to change its motion.

Newton’s First Law is also called the Law of Inertia

More Examples from Real Life

  • A powerful locomotive begins to pull a long line of boxcars that were sitting at rest. Since the boxcars are so massive, they have a great deal of inertia and it takes a large force to change their motion. Once they are moving, it takes a large force to stop them.
  • On your way to school, a bug flies into your windshield. Since the bug is so small, it has very little inertia and exerts a very small force on your car (so small that you don’t even feel it).

If objects in motion tend to stay in motion, why don’t moving objects keep moving forever?

  • Things don’t keep moving forever because there’s almost always an unbalanced force acting upon it.
  • A book sliding across a table slows down and stops because of the force of friction.

Newton’s Second Law

  • Force equals mass times acceleration.
  • F = ma
  • Acceleration: a measurement of how quickly an object is changing speed.

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