# Complete CRCT Warm-ups for today. Copy weekly assignments into your planner Distribute the four (4) handouts in your team folder.

## Presentation on theme: "Complete CRCT Warm-ups for today. Copy weekly assignments into your planner Distribute the four (4) handouts in your team folder."— Presentation transcript:

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

1.Which of the following BEST describes the difference between speed and velocity? A.Speed includes distance and direction while velocity includes only distance. B.Speed included distance and direction while velocity includes only direction. C.Velocity includes distance and direction while speed includes only direction. D.Velocity includes distance and direction while speed includes only distance.

1.Which of the following BEST describes the difference between speed and velocity? A.Speed includes distance and direction while velocity includes only distance. B.Speed included distance and direction while velocity includes only direction. C.Velocity includes distance and direction while speed includes only direction. D.Velocity includes distance and direction while speed includes only distance.

2.The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents Snoopy’s displacement from home? A.100 metersC. 200 meters east B.200 metersD. 280 meters east

3.The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents the distance Snoopy traveled? A.100 metersC. 200 meters east B.200 metersD. 280 meters east

4.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? A.Car AC. Car C B.Car BD. Cars A and B

5.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 secondsC. 5 seconds B. 2 secondsD. 20 seconds

S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. b.Demonstrate the advantages and disadvantages of series and parallel circuits and how they transfer energy. c.Investigate and explain that electric currents and magnets can exert force on each other.

What kind of circuits are used in our homes?

BIG IDEA #1 Moving electric charges transfer energy!

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

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

Which of the following are closed paths?

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

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

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

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

series circuit with * one battery * two lights * one switch Series Circuit

ADVANTAGES 1.Uses minimal amount of wire 2.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) Series Circuit

DISADVANTAGES 1.All devices must be working in order for electric current to flow Try It – take out one light bulb. Series Circuit If one device goes out, all devices stop working!

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? Series Circuit Less current is available and all lights are dimmed!

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

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

ADVANTAGES: 1.If one devices goes out, the other devices will stay on Try It – take out one bulb Parallel Circuit All the other bulbs stay on!

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 Parallel Circuit

DISADVANTAGES: 1.Batteries added in parallel do not increase the voltage in the circuit (but they will last longer) 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 Parallel Circuit

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.

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!