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

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.

Today’s Warm-UP

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.

Today’s Warm-UP

2. The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents Snoopy’s displacement from home?

A.100 meters C. 200 meters eastB.200 meters D. 280 meters east

Today’s Warm-UP

3. The diagram above shows Snoopy hike from Charlie Brown to the store. Which measurement represents the distance Snoopy traveled?

A.100 meters C. 200 meters eastB.200 meters D. 280 meters east

Today’s Warm-UP

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 A C. Car CB. Car B D. Cars A and B

Today’s Warm-UP

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 seconds C. 5 secondsB. 2 seconds D. 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?

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 RoundupWhich of the following are closed paths?

Circuit RoundupWhat 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 RoundupWhat is the purpose of a switch?

Designed to break the closed path of electric charge

Off – open circuitOn – closed circuit

Circuit RoundupWhat 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

Current follows a single path

Make a series circuit with * one battery* two lights* one switch

Series Circuit

Circuit Roundup

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

Series Circuit

Circuit Roundup

ADVANTAGES

1. Uses minimal amount of wire2. Energy sources in a series will

add togetherExample: If you put two 9 volt batteries together in a series circuit, the total voltage will be 18 volts ( 9 + 9 = 18)

Series Circuit

Circuit Roundup

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!

Circuit Roundup

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!

Circuit Roundup

Current follows more than one pathMake a parallel circuit with

* one battery* two lights* one switch

Parallel Circuit

Circuit Roundup

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

Parallel Circuit

Circuit Roundup

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!

Circuit Roundup

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

Circuit Roundup

DISADVANTAGES:1. Batteries added in parallel do not

increase the voltage in the circuit (but they will last longer)

Parallel Circuit

Circuit Roundup

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

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-PickStudent #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!