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Newton's Laws

Newton's Laws. I. Newton's First Law. DEFINITION. An object at rest will remain at rest and an object in motion will remain in motion until acted on by an outside force!. I. Newton's First Law Examples. EXAMPLE.

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Newton's Laws

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  1. Newton's Laws

  2. I. Newton's First Law DEFINITION An object at rest will remain at rest and an object in motion will remain in motion until acted on by an outside force!

  3. I. Newton's First Law Examples EXAMPLE If your book is sitting at rest on your desk it will remain at rest until an outside force (like a push from you) acts on it EXAMPLE If you are riding your bike you will remain in motion until acted on by an outside force (like friction).

  4. I. Newton's First Law Examples Blood rushes from your head to your feet while quickly stopping when riding on a descending elevator. EXAMPLE

  5. I. Newton's First Law Examples The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface. EXAMPLE

  6. I. Newton's First Law Examples To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and, thrusted downward at high speeds and then abruptly halted. EXAMPLE

  7. I. Newton's First Law Examples Video Clips Newton's First and Second laws, in Latin, from the original 1687 edition of the Principia Mathematica.

  8. Your Turn... You have TWO minutes to write three of your own examples of Newton's First Law of motion in your Science Notebook

  9. Let's review... The law of inertia states that an object _____________. A.) will continue moving in a straight line unless an outside force acts on it. B.) that is NOT moving will not move unless a force acts on it C.) will continue moving at the same velocity unless an outside force acts on it D.) all of the above

  10. Let's review... The law of inertia applies to __________. A.) both moving and nonmoving objects B.) moving objects C.) objects at rest

  11. Let's review... Swing a weight on a string around your head in a circular motion. If the string breaks, the weight will most likely… A.) continue to follow a circular path B.) follow a straight-line path

  12. Let's review... A card can be "flicked" from under a penny and fly across the room, but the coin wants to remain in its place (momentarily), the coin is said to have ___________.

  13. II. Newton's Second Law The net force on an object is equal to the power of its acceleration and its mass Force = Mass x Acceleration DEFINITION

  14. Newton's Second Law of Motion The force required to accelerate an object with a large mass is greater than the force required to accelerate an object with a smaller mass! So... Large Force It takes a great force to accelerate an object with a large mass, Small Force and it only takes a small force to accelerate an object with a smaller mass. accelerate- change speed or direction

  15. II. Newton's Second Law A force is a push or a pull. To calculate force, we use the following formula: F = ma where F = force in newtons where m = mass in kg where a = acceleration in m/sec2 FORMULA

  16. How do rubber bullets work?

  17. II. Newton's Second Law Practice Problem #1 With what force will a car hit a tree if the car has a mass of 3,000 kg & it is accelerating at a rate of 2 m/s2? Pull Pull F = (3,000 kg) (2 m/s2) F = 6,000 kg m/s2 F = 6,000 N ANSWER

  18. Problem #2 using formula F = ma A 10 kg bowling ball would require what force to accelerate it down an alleyway at a rate of 3 m/s2? ANSWER: F = (10 kg) (3 m/s2) F = 30 kg m/s2 F = 30 N Pull Pull

  19. Problem # 3 using formula a = F/m What is the acceleration of a softball if it has a mass of 0.50 kg & hits the catcher's glove with a force of 25 newtons? Pull Pull a = F a = 25 N m 0.50 kg a = 50 m/s2 ANSWER

  20. Problem # 4 using formula F = ma Pull Pull m = F m = 14,000 N a 5 m/s2 m = 2,800 kg ANSWER What is the mass of a truck if it is accelerating at a rate of 5 m/s2 & hits a parked car with a force of 14,000 newtons?

  21. III. Newton's Third Law DEFINITION Common expression of 3rd Law is, To every action there’s an equal and opposite reaction

  22. Newton's Third Law of Motion For every action there is an equal and opposite reaction! So... If a hammer exerts a force on a nail (action) then the nail exerts an equal and opposite force back on the hammer (reaction), causing the hammer to suddenly stop. When a rocket launches as the fuel burns it emits exhaust out the bottom of the rocket (action) and then the rocket is pushed in the up in the opposite direction (reaction).

  23. III. Newton's Third Law Demo Desk and Rolling Chair Flash

  24. Reaction ACTION

  25. III. Newton's Third Law Newton's Laws

  26. II. Newton's Third Law

  27. 1 3 2 3 1 2 1 2 In the boxes above you will read several examples of motion. Decide which of Newton's three Laws of Motion is described in each box. Click on the box and the answer will be revealed.

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