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Homeroom-SIT IN YOUR ASSIGNED SEAT! NO ELECTRONICS!!

Homeroom-SIT IN YOUR ASSIGNED SEAT! NO ELECTRONICS!!. Warm-up. A scientist noticed that all of the offspring of a bacteria are identical to the parent. However, in dogs, the offspring are all different. What most likely caused this to occur?

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Homeroom-SIT IN YOUR ASSIGNED SEAT! NO ELECTRONICS!!

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  1. Homeroom-SIT IN YOUR ASSIGNED SEAT! NO ELECTRONICS!!

  2. Warm-up A scientist noticed that all of the offspring of a bacteria are identical to the parent. However, in dogs, the offspring are all different. What most likely caused this to occur? • Bacteria produced offspring through asexual reproduction, while the dog produced offspring through sexual reproduction. • Bacteria produced offspring through sexual reproduction, while the dog produced offspring through asexual reproduction. • Both bacteria and the dog produced offspring through asexual reproduction. • Both bacteria and the dog produced offspring through sexual reproduction.

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

  4. 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.

  5. Forces change motion.

  6. HMM…. Can you see the unbalanced force here?

  7. 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.

  8. 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.

  9. Force=mass x acceleration F=m x a

  10. Force and mass determine acceleration.

  11. Luke! Use the mass times the acceleration!

  12. How much Force was required to make a 2000kg car accelerate at 5m/s/s? • 400N • 0.001N • 10,000N Force=Mass x acceleration F=ma F=2000kg x 5m/s/s a= 10,000N or kgxm/s/s

  13. Friction

  14. 4 Types of Friction • The 4 types of friction are: • Sliding friction (strongest) • Rolling friction • Fluid friction (weakest). • Static friction

  15. What type of friction?

  16. What type of friction?

  17. What type of friction?

  18. What type of friction?

  19. 2 Factors of Friction • 1-Type of surface. • 2-How hard the two surfaces push together.

  20. Which type of hockey has more friction?

  21. Gravity

  22. 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.

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

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

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

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

  27. Momentum • The momentum of an object is the product of its mass and velocity. • In other words: Momentum = mass x velocity Kg x m/s

  28. COLLISIONS

  29. Law of Conservation of Momentum • The total momentum of the objects that interact does not change.

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