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### Course: Middle school physics>Unit 2

Lesson 3: Electric forces

# Electric forces

Electric forces, a type of non-contact force, can act on objects without touching. These forces are caused by electric charges in matter. Objects can have positive, negative, or neutral charges. Electric forces can attract or repel, depending on the charges involved. The strength of the force depends on the charge and distance between objects. Created by Khan Academy.

## Want to join the conversation?

• How do we make two balloons repel each other?
• You can make two balloons repel each other by on wool cloth both getting negative charges.
• Why are things more prone to static in the wintertime than summer? Summer is more humid...but I thought water conducts electricity. Or is it the heat of the sun that lessens it?
• As a Chinese, I have an easy answer for this.
When it's drier, the moisture and sweat on your hand easily jumps from one place to another, creating static. When it's wetter, the charges try to reach their destination but keep bouncing around in the air due to excessive moisture. This change is very significant when you travel from say, Shanghai to Beijing, you need to be very careful of static in Beijing.
• could a normal ballon pop another normal ballon with nothing on it
• Under normal circumstances, a normal balloon would not be able to pop another normal balloon without anything on it. This is because the force exerted by a regular inflated balloon is not typically strong enough to burst another balloon.

However, if the balloons are subjected to additional forces or conditions that increase the pressure or introduce sharp objects, it is possible for one balloon to pop another. For example, if one balloon is filled with a significant amount of air or if external pressure is applied to it, it may have enough force to burst a second balloon.

In general, though, two normal balloons without any additional factors would not pop each other.
• i like that
• For anyone who wants to know, When she said that the dryer creates an "Electric force" its not actual electricity, it's called "Static electricity" This “separation of charge” is the reason for the collection of effects we call static electricity. If two objects have different charges, they attract (or pull towards) each other. If two objects have the same charge, they repel (or push away) from each.

Hope this helped :)
• what will happen if both of the objects have neutral charges
• Then there is no electric force between the objects.
• How come socks get more electrical charges, while the shirt is still positively charged?
• not exacly because the martireal on socks are no electrical conductive
(1 vote)
• Hello I have a question about negative and positive charges. What were to happen if a neutral charge met with another neutral charge, would they repel? And what if a neutral charge were to meet with a negative or positive charge, with they attract?ಠ_ಠThank you for the help whoever responds.^.^
• Because neutral charges have zero charge, nothing will happen. When a neutral charge meets a positive or negative charge, they will attract.