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Set your stuff down, get ready to go to the media center for first part of class

Learn about the concept of force, its definition, different types of forces, and Newton's laws of motion. Discover how forces act on objects through force diagrams and understand the principles of inertia, net force, and action-reaction. Get ready to explore all these topics in the media center!

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Set your stuff down, get ready to go to the media center for first part of class

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  1. Set your stuff down, get ready to go to the media center for first part of class

  2. WHAT IS A FORCE?.

  3. A push or pull in a direction Force- Definition

  4. Forces are measured in Newtons (N) • They usually work in pairs • Have a direction • Affect motion Characteristics of Forces

  5. Gravity • Friction • Magnetic • Elastic • Applied Force Types of Forces

  6. How do Forces act on Objects? Force Diagrams Normal force (force of ground/Earth) friction gravity

  7. Force Diagrams“free fall” friction (air resistance) gravity

  8. Normal force (force of slide/Earth) Force Diagram friction gravity

  9. Normal force (force of ground/Earth) Force Diagrams Applied (guy pushing) friction gravity

  10. Net Force = The sum of all the forces on an object • Same direction, add • 20+10=30N • Opposite direction, subtract (bigger one wins) • 20-10= 10N Net Force

  11. STOPPED HERE ON FEB 11

  12. Newton’s Laws of Motion I. Law of Inertia II. F=ma III. Action-Reaction

  13. While some people know what Newton's laws say, many people do not know what they mean (or simply do not believe what they mean). Newton’s 3 Laws of Motion

  14. 1st Law of Motion (Law of Inertia) Objects will stay at rest, or stay in motion until an outside force acts on it.

  15. 1st Law • Inertia the tendency of an object to resist changes in motion The more mass, the more inertia something has

  16. 1st Law • Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.

  17. 1st Law • Once flying in the air, if an unbalanced force wasn't applied (such as gravity or air friction), it would never stop!

  18. Question Why then, do we observe every day objects in motion slowing down and becoming motionless seemingly without an outside force?

  19. FRICTION!! Objects on earth, are under the influence of friction. (friction from the air, friction when rolling on a surface, friction when sliding)

  20. Newtons’s 1st Law and You Don’t let this be you. Wear seat belts! Because of inertia, objects (including you) resist changes in their motion. When the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 m/hour.

  21. Newton's 2nd Law F = m a

  22. 2nd Law The net force of an object is equal to the product of its mass and acceleration, or F=ma. Force = Mass x Acceleration

  23. Newton's 3rd Law • For every action, there is an equal and opposite reaction. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.

  24. 3rd Law Birds depend on Newton’s third law of motion. As the birds push down on the air with their wings, the air pushes their wings up and gives them lift.

  25. 3rd Law • Think of a car moving forward..... • Which direction do the wheels move against the road in the picture below?? Car moving this way

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