Electric Forces

Electric Forces

Multiple Choice

QUICK CHECK:

All magnets 🧲 must have 2 poles; North pole & South pole.

• True

• False

Multiple Choice

QUICK CHECK:

Magnets 🧲 with similar poles tend to:

• Attract

• Repel

Multiple Choice

QUICK CHECK:

Magnets 🧲 with opposite poles tend to:

• Attract

• Repel

What are we going to learn today

Electric force and Electric charge

Poll

Electric charges surround you all the time. Some electric charges, such as lightning, are quite strong. Others are barely noticeable. What happens when two electrically charged objects get near each other?

• The two objects will be pulled toward each other

• The two objects will be pushed away from each other

• The two objects will either be pulled together or pushed apart

• The charges will cancel out and neither object will move toward or away from the other

Why does the balloon attract the water?

BEND WATER – WITH YOUR HAIR?

BEND WATER – WITH YOUR HAIR?

When you rub a balloon on your head electrons move from your head to the balloon. This causes the balloon to be negatively charged and your head to be positively charged. Because opposite charges attract each other, the balloon will now stick to your head as well as other things such as a wall. It can also cause a stream of water to bend.

Multiple Choice

What happens when you rub a balloon on your hair?

• The balloon to be negatively charged.

  Your head to be positively charged.

• The balloon to be positively charged.

  Your head to be negatively charged.

Multiple Choice

The water stream will be attracted to the balloon because:

• The balloon is positively charged, while the water stream will be negatively charged.

• The balloon is negatively charged, while the water stream will be positively charged.

Conclusion

So, just like the magnetic force:

Like charges tend to repel.

Opposite charges tend to attract.

Multiple Choice

If you bring two positive charges near each other, what will happen?

• The two charges will repel from each other

• The two charges will attract each other

Multiple Choice

If you bring two negative charges near each other, what will happen?

• The two charges will repel from each other

• The two charges will attract each other

Multiple Choice

If you bring a negative charge and a positive charge near each other, what will happen?

• The two charges will repel from each other

• The two charges will attract each other

Multiple Choice

Electric charges surround you all the time. Some electric charges, such as lightning, are quite strong. Others are barely noticeable. What happens when two electrically charged objects get near each other?

• The two objects will be pulled toward each other

• The two objects will be pushed away from each other

• The two objects will either be pulled together or pushed apart

• The charges will cancel out and neither object will move toward or away from the other