Question

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Stan runs a comb through his hair then brings it near several strips of paper. The paper starts to move without Stan touching it. His little sister is amazed and wants to know how the trick works. Stan says that the comb has a static charge, but doesn't know how it got its charge. What would you tell Stan?


Electrons move from the comb to Stan's hair giving it a neutral charge.


Electrons from Stan's hair transferred to the comb giving it a negative charge.


Electrons from the paper strips jumped to the comb causing the strips to move.


Protons from Stan's hair transferred to the comb giving it a negative charge.


Kennedy and Lilly are in science class. They are asked to prove that some forces are non-contact forces. The girls list five examples of objects exerting a force on each other without touching. Do you agree with their list? Tell why or why not?

Two like magnetic poles repel each other.
Putting on a wool sweater can make your hair get static electricity when it rubs against the sweater.
When you bring two negatively charged balloons near each other they push each other away.
Magnets stick to a refrigerator.
A motor uses magnets to transform electrical energy into mechanical energy.






Number 1, 3 and 5 all demonstrate non-contact forces because the magnets or electrically charged objects exert forces on each other without touching.


All five are good examples of non-contact forces since they all use either magnets or electric charge which are non-contact forces.


Number 1 and 3 are both good examples to prove non-contact forces since the magnets and balloons are not touching.


Number 1 and 4 are non-contact forces since they both use magnets.

Answer 1

This is called electrostatic force....

Hope this helps u...

Thnks babe!

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