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Thread: Hi.. I have some questions regarding gravitational forces..

  1. #1 Hi.. I have some questions regarding gravitational forces.. 
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    3. How is the gravitational force between two massive objects similar to and different from the electric force between two charged objects?


    well, I thought the similarities would be pull and push, just like - and + attracts each other.

    and the difference is that, gravity doesn't repel like electric forces do.

    is this right?


    4. Place a fridge magnet F on the door of a refrigerator R. How do we know that F, but not R, is the source of a permanent magnetic field? You may want to experiment with some pins, staples, or paper clips to prove your point.

    holy moly..


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  3. #2  
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    3. I think you are on the right track. Another similarity is that the force decreases the farther the objects are away from each other. Google "inverse square law" and read about it.

    4. If you are allowed to take the magnet off the fridge you could see which attacts the pins, the magnet or the fridge. If you have to leave the magnet on the fridge you should still be able to prove the point, shouldn't you? What do you think would happen to the pins or paper clips if the whole fridge was magnetized?


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  4. #3  
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    Quote Originally Posted by Harold14370
    3. I think you are on the right track. Another similarity is that the force decreases the farther the objects are away from each other. Google "inverse square law" and read about it.

    4. If you are allowed to take the magnet off the fridge you could see which attacts the pins, the magnet or the fridge. If you have to leave the magnet on the fridge you should still be able to prove the point, shouldn't you? What do you think would happen to the pins or paper clips if the whole fridge was magnetized?
    well for number 3, I think gravitational force has no such thing like "push".

    isn't it always "pulling" each other?? and isn't "push" forces like "repelling" in electric forces..??? for example, electric forces somtimes "attract" (is this pull or push? I think it is similar to the pull effect in gravity??) and
    "repel" so it is like "push..??"

    and i didn';t get no.4 fully.. sorry, but can you explain further.?
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  5. #4  
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    I agree with you about question 3.

    On question 4, I am trying to help you out without doing your homework for you. Now, you see object F sticking to object R and you know one of them is a permanent magnet and one is just steel. How would you test which is which? You already have the hint that you would use metal objects like pins or staples, so just think about what would happen if you put the pins and staples on object F or object R. If object R, the refrigerator, is the permanent magnet what would you see?
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  6. #5 about your question to 3rd 
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    actually ,these two forces (i.e gravitational forces and electric forces ) are the fundamental fores of nature. While the gravitational forces has the property to attract an object where as the electric forces has the both nature of pull and push since particle involved are charged which makes them behave differently.
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