Newtons Laws of Motion


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Newtons Laws of Motion

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Newtons Laws of Motion

  1. 1. Newton’s Laws of Motion
  2. 2. 1st Law of Motion O An object at rest will stay at rest and an object in motion will stay in motion (in the same direction and at a constant speed) UNLESS an unbalanced force is applied.
  3. 3. 1st Law of Motion
  4. 4. Examples O Can you explain these using the 1st Law of Motion?
  5. 5. 1st Law O More simply stated: O If an object is moving, they want to stay moving. O If an object is still, they want to stay still. O The only way to change what they an object is doing is to apply a force.
  6. 6. Law of Inertia O Objects are lazy – they do not want to stop what they are doing. O What can we call this “laziness?” Inertia O Inertia is a measure of it’s resistance to change. O The more resistant, the more inertia O Newtons’ First Law is also called the
  7. 7. 2nd Law of Motion O Usually stated as an equation: F = ma O What does this mean? O And don’t say force equals mass times acceleration. Anyone can say that, but do you really understand what it means? O What if I restated the equation?
  8. 8. Newton’s 2nd Law Explained O It means the acceleration of an object depends on two things – the mass of the object and the amount of force you apply to change its motion. O Let’s look at this relationship.
  9. 9. Let’s Look Mathematically O If I double the numerator, what happens? = 4 = 8 4 4 O When one variable increases, another variable increases the same amount. O This is called a direct proportion O Which 2 variables are directly proportional? O What does that mean? But this is science class!
  10. 10. Math and Science O What happens when I increase the denominator? O Let’s try! O4 = 4 = O4 8 O This is called an indirect proportion, or inverse proportion O Which 2 variables are inversely proportional? O What does that mean?
  11. 11. Newton’s 2nd Law O Look at the equation. Think of the previous fractions. Can you explain what it means now?
  12. 12. 2nd Law of Motion O The greater the applied force, the faster the object will move (acceleration). O The more mass an object has, the more force you need to change it’s motion
  13. 13. 3rd Law of Motion O For every action, there is an equal and opposite action.
  14. 14. Let’s Review Newton O Once moving at a steady speed In a straight line It will continue moving At a steady speed In a straight line O Once standing still It will stay still
  15. 15. Newton O It accelerates in the direction that you push it If you push twice as hard, it accelerates twice as much O If it has twice the mass It accelerates half as much
  16. 16. Newton O If you push on it It pushes on you
  17. 17. Check out these videos O ractives/literacy/newton/newton. html O
  18. 18. Questions?