Electric forces

Electric charges

IN the next slide, click on "open in new tab" to open the simulation.

You will be answering questions based on this simulation as you go through the lesson. On your marks, get set, go!!!

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Multiple Choice

1. How many different charges do you see? 

• three

• one

• two

• four

ATOMS HAVE...

positive charges and negative charges. Normally thOSE CHARGES attract and cancel each other out, making the atom neutrally charged. BUT SOMETIMES THINGS CHANGE!!

SCROLL RIGHT TO DISCOVER

Fill in the Blanks

1. Click on reset balloon on the phet simulation. Move the balloon around and close to nearby objects. What happens? 

2. It turns out that when some objects rub against another object, negative charges are transferred from one object to the other one, making the transferring object________ and the recieving object_________

Note: write two of the options given in the hint according to their order in the paragraph.

Take the balloon in the phet simulation and rub it against the sweater. Drag it back to the middle of the screen until the balloon string is straight, and then let go of it.

Multiple Choice

What happens? 

• The balloon stays still

• The sweater moves

• The balloon sticks to the sweater

• The balloon sticks to the wall

Multiple Choice

1. Click reset the balloon. Then, Rub it against the wall. What happens? 

• Negative charges are transferred from the balloon to the wall

• Positve charges are transferred from the balloon to the wall

• There is no transference of charges

• Charges start to jump up and down

1) Rub the balloon against the sweater. 2) then, drag the charged balloon slowly toward the wall.

Multiple Choice

1. What happens to the negative charges in the wall?

• Negative charges in the wall move close to the negative charges in the balloon.

• Negative charges in the wall start to move frantically in every direction

• Negative charges in the wall move away from the negative charges in the balloon.

• Negative and negative charges attract each other

Why did the balloon sticked to the sweater or to the wall? Take notes of the answer in your notebook

It all is due to electric forces!

Electric forces are forces between charged particles or objects. Like forces repel, opposite forces attract. 

Draw

You could use your learning about electric charges to make a ball levitate on a surface. Make a model of it (sketch) labeling what the elect ric charges of each object should be. Use a negative or positive sign to represent the charges.

Multiple Choice

Click on reset balloon. Gently drag it toward the sleeve making sure very few charges are transferred. Drag balloon back to its original position where its string is straight. Then let it go. What do you notice?

• The balloon will stick to the sleeve very fast

• The balloon will fly away
• The balloon will return to its original position.
• The balloon will stick to the sleeve very slowly

Multiple Choice

Repeat previous step but this time make sure the balloon picks up as many charges as possible. After returning it to its original position, let it go. What do you notice?

• The balloon will stick to the sweater very quickly

• The balloon will stick to the sweater very slowly

• The balloon will stick to the wall very quickly

• The balloon will stick to the wall very quickly

TAKE NOTES OF THIS:

The strength of the electric force depends on the amount of charge present. When more charge is involved the electric force is stronger.
The strength of the electric force also depends on the distance between charges. For example, when a positively charged particle is close another positively charged particle, a strong force between them pushes them away from each other. As they move apart the force between them becomes weaker.

Poll

If you wanted two charged objects to repel each other more strongly, you would

• Place them close to another

• Place them away from one another

• Charge the objects more

• Charge the objects less

Electric charges play a major role

In daily life. Everytime you use electricity you are using energy from electric charges that are in motion. The charges flow through materials like water flows down a stream. The continous flow of charge is known as electric energy.

Poll

Where can we see electric forces in action?

• Hair standing on end on a trampolin

• Turning on my cell phone

• Opening the water tap

• It is just for scientists