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8 th Science Force, Motion, and Energy

8 th Science Force, Motion, and Energy . #1 What is speed plus direction ? Example: Geese fly about 64 km/ hr when they migrate south. Force. Weight. A:. B:. Acceleration. Velocity. C:. D:. D. Velocity . #2 Forces occur in pairs and each pair of forces can be

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8 th Science Force, Motion, and Energy

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  1. 8th Science Force, Motion, and Energy

  2. #1 What is speed plus direction? Example: Geese fly about 64 km/hr when they migrate south. Force Weight A: B: Acceleration Velocity C: D:

  3. D. Velocity

  4. #2 Forces occur in pairs and each pair of forces can be either balanced or unbalanced. How can an unbalanced force change the speed or direction of an object in motion? One of the forces is stronger than the other Both forces are equal A: B: Unbalanced forces cancel each other out, so there is no change Force C: D:

  5. A. One of the forces is stronger than the other

  6. #3 Which unit measures the Unit of Force? Newtons Meters A: B: 2 Seconds m/s C: D:

  7. A. Newtons

  8. #4 An object a rest remains at rest and an object in motion remains in motion at a constant speed unless acted upon by a unbalanced force. Ex: Seat belt Ex: pulling the table cloth out from under dishes Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

  9. Law 1 – • Law of Inertia

  10. #5 An object acted on by an unbalanced force will accelerate in the direction of the force. *(More force is required to move more mass.) Ex: It takes more force to move a car than a bicycle Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

  11. B. Law 2 – Law of Acceleration

  12. #6 Every action has an equal and opposite reaction. Ex: Rocket launching. Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

  13. C. Law 3 – Law of Action and Reaction

  14. #7 Measure Speed What is your speed if you travel 114 km in 3 hours? Speed = Distance Time S = 38 km/hr S = 38 hrs A: B: S = 38 km S = 3 km/hr C: D:

  15. A. S = 38 km/hr

  16. #8 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N Box will move to the left 6N Box will move to the right 6 N A: B: The force is balanced None of these C: D:

  17. A. Box will move to the left 6N

  18. #9 This graph relates distance to time for a jogger. Distance vs. Time At what rate of speed is Juan running between 4 min and 6 min? S= 500m/2min 250m/s 150m/s A: B: None of these 1400m/s C: D:

  19. B. 250m/s

  20. #10 This graph relates distance to time for a jogger. Distance vs. Time What can you tell about Juan’s motion between 7 and 11 min? Ran faster Stopped A: B: None of these Jogging slower C: D:

  21. A. Stopped

  22. Great Job!!!! Thank you for playing!

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