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Understanding Newton's Laws of Motion

Discover how Isaac Newton's theories on forces and motion, known as Newton's Laws of Motion, explain movement around us. Explore the concepts of balanced forces, inertia, and action-reaction pairs in this enlightening unit.

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Understanding Newton's Laws of Motion

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  1. Unit 4Motion & Forces

  2. Laws of Motion

  3. About 300 years ago, a scientist named Isaac Newton had some ideas about forces and motion

  4. His ideas became known as Newton’s Law’s of Motion They are called laws because they correctly explain certain happenings around you

  5. One of the Newton’s laws says that if all the forces acting on an object are balanced the object will keep its state of motion

  6. In other words, if the object is at rest, or not moving it will stay at rest, or not move

  7. If the object is moving it will keep moving

  8. The state of motion will stay the same unless the forces become unbalanced by some other force

  9. Suppose you see a soccer ball on the grass It is at rest

  10. The force of the ground pushing up on it is balanced by the force of gravity pulling down on it

  11. The soccer ball will keep its state of motion which in this case is no motion

  12. Suppose you kick the ball You have unbalanced the forces with the force of your kick

  13. The ball will be in motion The ball will stay in motion until some other force comes along

  14. In this case, a force called friction will stop the ball after awhile

  15. Another law of motion says that for every action there is an equal and opposite reaction

  16. When a rocket is launched burning fuel makes hot gases come out of the bottom of the rocket

  17. The rocket pushes on the gases and takes off moving away from Earth

  18. The gases pushing the rocket is the action Action Reaction The rocket moving up is the reaction

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