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Today’s Warm-UP

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  1. Today’s Warm-UP • Complete CRCT Warm-ups for today. • Copy weekly assignments into your planner • Distribute the four (4) handouts in your team folder

  2. Today’s Warm-UP • Which of the following BEST describes the difference between speed and velocity? • Speed includes distance and direction while velocity includes only distance. • Speed included distance and direction while velocity includes only direction. • Velocity includes distance and direction while speed includes only direction. • Velocity includes distance and direction while speed includes only distance.

  3. Today’s Warm-UP • Which of the following BEST describes the difference between speed and velocity? • Speed includes distance and direction while velocity includes only distance. • Speed included distance and direction while velocity includes only direction. • Velocity includes distance and direction while speed includes only direction. • Velocity includes distance and direction while speed includes only distance.

  4. Today’s Warm-UP • The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents Snoopy’s displacement from home? • 100 meters C. 200 meters east • 200 meters D. 280 meters east

  5. Today’s Warm-UP • The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents the distance Snoopy traveled? • 100 meters C. 200 meters east • 200 meters D. 280 meters east

  6. Today’s Warm-UP • The diagram below shows three cars traveling. All cars are traveling at the same speed, 50 km/hr. Which car has a velocity of 50 km/hr going west? • Car A C. Car C • Car B D. Cars A and B

  7. Today’s Warm-UP • Sound travels at a speed of 330 meters/second. If John hears a police siren 165 meters away, how long did it take for the sound to travel from the police siren to his ear? • A. 0.5 seconds C. 5 seconds • B. 2 seconds D. 20 seconds

  8. Science Standard • S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. • Demonstratethe advantages and disadvantages of series and parallel circuits and how they transfer energy. • Investigate and explainthat electric currents and magnets can exert force on each other.

  9. Essential Question What kind of circuits are used in our homes?

  10. Circuit Roundup BIG IDEA #1 Moving electric charges transfer energy!

  11. Circuit Roundup BIG IDEA #2 Circuit control the flow of electric charge.

  12. Circuit Roundup Electric charge flows in a loop. The loop must be a closed path.

  13. Circuit Roundup Which of the following are closed paths?

  14. Circuit Roundup What must every circuit have? 1. Energy source 2. Wire - Conductor to form path 3. Load – An electrical device that changes the electric energy into another form of energy

  15. Circuit Roundup What is the purpose of a switch? Designed to break the closed path of electric charge Off – open circuit On – closed circuit

  16. Circuit Roundup What is a short circuit? An unintended path connecting one part of a circuit with another. Example #1 – Wires in a frayed lamp cord touch each other Example #2 – Person touches a fallen power line

  17. Circuit Roundup Series Circuit Current follows a single path Make a series circuit with * one battery * two lights * one switch

  18. Circuit Roundup Series Circuit series circuit with * one battery * two lights * one switch

  19. Circuit Roundup Series Circuit ADVANTAGES Uses minimal amount of wire Energy sources in a series will add together Example: If you put two 9 volt batteries together in a series circuit, the total voltage will be 18 volts ( 9 + 9 = 18)

  20. Circuit Roundup Series Circuit DISADVANTAGES All devices must be working in order for electric current to flow Try It – take out one light bulb. If one device goes out, all devices stop working!

  21. Circuit Roundup Series Circuit DISADVANTAGES 2. Resistance builds and current is reduced every time another device is added Try It – add one light bulb; observe; add another light bulb What happens? Less current is available and all lights are dimmed!

  22. Circuit Roundup Parallel Circuit Current follows more than one path Make a parallel circuit with * one battery * two lights * one switch

  23. Circuit Roundup Parallel Circuit Draw a parallel circuit with * one battery * two lights * one switch

  24. Circuit Roundup Parallel Circuit ADVANTAGES: If one devices goes out, the other devices will stay on Try It – take out one bulb All the other bulbs stay on!

  25. Circuit Roundup Parallel Circuit ADVANTAGES: 2. As more devices are added, each device has its own branch to the power sources. Resistance is reduced and more current will flow. Try It – Add one more bulb to the circuit; observe; add one more bulb to the circuit; observe

  26. Circuit Roundup Parallel Circuit DISADVANTAGES: Batteries added in parallel do not increase the voltage in the circuit (but they will last longer)

  27. Circuit Roundup Parallel Circuit DISADVANTAGES: 2. As more devices are added to a parallel circuit, more heat is produced by the devices – DANGER requires fuses or circuit breakers to prevent overheating

  28. Circuit Roundup What type of circuit is used in homes? Why? Parallel circuits – so you can turn off a device in one room without making every thing else turn off.

  29. Fan-n-Pick Student #1 – Fans the cards face down Student #2 – Picks a card and read the question; pass card to student #4 Student #3 – Answers the question Student #4 – Praise if correct or tutor if wrong Rotate positions; repeat until all eight cards are used!