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Forces

Forces. Force and Net Force. Force is a push or a pull on an object. Net force is the total force on an object. Unbalanced Force Balanced Force. The balanced forces are the forces in equal and opposite directions.

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Forces

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  1. Forces

  2. Force and Net Force • Force is a push or a pull on an object. • Net force is the total force on an object.

  3. Unbalanced ForceBalanced Force • The balanced forces are the forces in equal and opposite directions. • Unbalanced Forcecan cause an object to move, stop moving, or change direction.

  4. Forces change motion.

  5. Newton’s First Law Inertia Greater mass means Greater inertia • An object at rest will stay at rest unless acted upon by an outside force. • Inertia is every objects resistance to change its motion.

  6. Newton’s Second Law • The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object’s mass.

  7. Force=mass x acceleration F=m x a • Or • a = Force/ mass • a = F/m

  8. Equation for Newton It’s the same as the force equation! • Newton=m x a.

  9. Force and mass determine acceleration.

  10. Sometimes we might calculate mass using Force and Acceleration • Mass=Force/Acceleration • m=F/a

  11. How much Force was required to make a 2000kg car accelerate at 5m/s? • 400N • 0.001N • 10,000N

  12. If you drop a 15kg bowling ball with a Force of 147N, what is it’s acceleration? • 9.8m/s/s • 0.1m/s/s • 2,205m/s/s

  13. A person throws a baseball at an acceleration of 25m/s/s with 12.5N of Force. What’s the Mass of the ball? • 312kg • .5kg • 2kg

  14. Friction

  15. 4 Types of Friction • The 4 types of friction are: • Sliding friction (strongest) • Rolling friction • Fluid friction (weakest). • Static friction

  16. What type of friction?

  17. What type of friction?

  18. What type of friction?

  19. What type of friction?

  20. 2 Factors of Friction • 1-Type of surface. • 2-How hard the two surfaces push together.

  21. Which type of hockey has more friction?

  22. Gravity

  23. Air Resistance and Weight • Air resistance is a type of fluid friction on falling objects. Weight is the force of gravity on an object at the surface of the Earth.

  24. Law of Universal Gravitation • Gravity acts between all objects in the universe.

  25. Gravity Between Objects • The force of gravity between objects increases with greater mass and decreases with greater distance.

  26. Gravity

  27. Gravity is the force that pulls objects toward the Earth- acceleration due to gravity is 9.8m/s/s.

  28. Newton’s Third law • If an object exerts a force on another object, the second object, exerts an equal force in the opposite direction.

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