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## Today’s Warm-UP

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**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**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.**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.**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**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**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**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**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.**Essential Question**What kind of circuits are used in our homes?**Circuit Roundup**BIG IDEA #1 Moving electric charges transfer energy!**Circuit Roundup**BIG IDEA #2 Circuit control the flow of electric charge.**Circuit Roundup**Electric charge flows in a loop. The loop must be a closed path.**Circuit Roundup**Which of the following are closed paths?**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**Circuit Roundup**What is the purpose of a switch? Designed to break the closed path of electric charge Off – open circuit On – closed circuit**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**Circuit Roundup**Series Circuit Current follows a single path Make a series circuit with * one battery * two lights * one switch**Circuit Roundup**Series Circuit series circuit with * one battery * two lights * one switch**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)**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!**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!**Circuit Roundup**Parallel Circuit Current follows more than one path Make a parallel circuit with * one battery * two lights * one switch**Circuit Roundup**Parallel Circuit Draw a parallel circuit with * one battery * two lights * one switch**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!**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**Circuit Roundup**Parallel Circuit DISADVANTAGES: Batteries added in parallel do not increase the voltage in the circuit (but they will last longer)**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**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.**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!