8th-T2 L1: Electric Forces

Open Ended

What do you think the word charge and neutral mean?

Draw

Draw dots to indicate the paths of the moving electric charges from a cloud to the ground.

Poll

Do you think this atom is neutral, positive or negatively charged?

• positive

• negative

• neautral

Open Ended

What needs to happen in order to make an object neutral?

Open Ended

What needs to happen in order to make an object negatively charged? How can a neutral object become negative?

Multiple Choice

Is the electric field stronger within the white rectangle or within the blue rectangle in image C?

• blue

• white

Multiple Choice

Is the electric field stronger close to the charges or farther away from the charges?

• closer

• further

Draw

In which direction would a positive charge move if it were placed in between the positive and negative charges in image C?

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Match

Match the following

• is neutral

• repels

two neutral charges

electric force between opposite charges

electric force between two like charges

• two neutral charges

• electric force between opposite charges

• electric force between two like charges

Multiple Choice

How would the electric force between two charged objects change if the objects were moved farther apart?

• it would get stronger

• it would get weaker

• it would stay neutral

Open Ended

When the two pith balls have opposite charges, they are naturally pulled together due to the attractive electric force between them. If you pull the two pith balls away from each other, what happens to the potential energy of the system? Explain.

Open Ended

What is a circuit?

Open Ended

What is electrical current?

Draw

Draw dots and arrows to represent current flowing through the circuit.

Draw

Based on potential energy, which direction should the current flow? Explain your answer.

Poll

What kind of energy do you think the battery is?

• Chemical energy

• thermal energy

• electrical energy

• mechanical energy

• nuclear energy

Draw

Is the positive terminal or the negative

terminal of a battery the position of higher 

potential energy?

Match

In the process that moves current through the system shown, what form of energy is the input? The output?

• input energy

• output energy

• none

chemical potential energy

light energy

none

• chemical potential energy

• light energy

• none

Open Ended

Describe why current flows through a circuit, and explain why some materials allow charges to flow more easily than others.

Labelling

Electrical conductors and insulators are all around you. Label each of these common items as a conductor or an insulator.

Drag labels to their correct position on the image

conductor

insulator 2

insulator 1

Open Ended

Which of the materials used to make these objects would you use in a circuit? Explain why.

Open Ended

Why is a quarter a better electric  

conductor than a rubber eraser?

Open Ended

What is static electricity?

Draw

What do you notice about this image?

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Labelling

Label the method of charging in each image

Drag labels to their correct position on the image

conduction

friction

polarization

Draw

The balloon attracts the paper because of static electricity. Draw the charges on the balloon and on the bits of paper.

Open Ended

Then, describe what happens to potential energy as you pull the bits of paper off of the balloon.

Open Ended

What happens to charges during static discharge?