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Posted: 7/31/2018 1:55:00 PM EDT
Then how do magnets work? How can I put a magnet on my refrigerator and it not fall off? Wouldn’t it use magnetic energy to pull itself to the fridge to resist gravity? So how come it never falls off?
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How do magnets become magnets and how much energy is required to make them that way?
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Does gravity use up gravitational energy? When will the Earth run out of it?
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Electromagnetic force is one of the fundamental forces like gravity. The attraction is energy that is never destroyed.
I’ll blow your mind op. Water, falling downhill, turning a bunch of magnets “creates” energy in the form of electricity. If you realize it doesn’t create energy only transfers it then the lightbulb will go on in your head. |
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I know the answer but I'm not telling OP. The learning of the thing is often more important than the knowing of the thing.
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Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature
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Work = force x distance. Neither the magnet nor the refrigerator are moving -> no work -> no energy is used.
You should read a Physics book someday. |
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Then how do magnets work? How can I put a magnet on my refrigerator and it not fall off? Wouldn’t it use magnetic energy to pull itself to the fridge to resist gravity? So how come it never falls off? View Quote |
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Quoted:
Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature View Quote |
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The magnetic field comes from the motion of the core (which is a giant solid blob of nickel and Iron) in the earth... so there is that.
The magnets are the same but on a smaller scale, it is an inherent property of the universe, AKA one of the fundamental forces. Just like Gravity, it is the result of the mass of the earth and is a reversible conservative force. No my friend you have not broke the second law... It's all good. |
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Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature View Quote Yes and because there is no work there is no heat. Therefore the magnet doesn't cook aand thus stays in it's raw state, stuck forever. Why do you think they call it a "rare Earth magnet?" Duh. |
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Yes and because there is no work there is no heat. Therefore the magnet doesn't cook aand thus stays in it's raw state, stuck forever. Why do you think they call it a "rare Earth magnet?" Duh. View Quote View All Quotes View All Quotes Quoted:
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Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature Duh. My new sig line if you don't mind! |
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How is it equal? The magnet is sideways actively resisting the pull of gravity. If I leave the magnet up for 2 mins it uses less energy than if I left it up there 2 years? View Quote View All Quotes View All Quotes Quoted:
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Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature There is no energy being used in your example. Only 2 forces at work. |
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No work is being done by a magnet sticking to a refrigerator and holding on.
Work is done when the magnet sticks to it - there is a collision between the magnet and the attracted object - and then work must be expended to pull the objects back apart. Net zero. |
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Quoted: How is it equal? The magnet is sideways actively resisting the pull of gravity. If I leave the magnet up for 2 mins it uses less energy than if I left it up there 2 years? View Quote |
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How is it equal? The magnet is sideways actively resisting the pull of gravity. If I leave the magnet up for 2 mins it uses less energy than if I left it up there 2 years? View Quote View All Quotes View All Quotes Quoted:
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Beacause the energy you exerted to pull the magnet off the refrigerator is reciprocal to the energy it constantly exerts to stay in place. It's a weird balance of nature |
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Then how do magnets work? How can I put a magnet on my refrigerator and it not fall off? Wouldn’t it use magnetic energy to pull itself to the fridge to resist gravity? So how come it never falls off? View Quote |
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Energy is defined as force times displacement. It the force doesn’t move what it is acting upon, then it isn’t energy. It’s just a force.
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The magnetic effect isn't energy; it is a force. View Quote If an object falls to the Earth's surface, it will exert a force on the Earth proportional to its mass. Of course, the object will exert an equal force on the Earth. If you want to put the object back into deep space, you will have to expend the same energy it released when it crashed. This is, of course, discounting all other variables. While it's lying on the ground, no work is being done, there is no expending of energy, just like there is no expending of energy when a magnet is stuck to a surface. Energy is only expended when the magnet sticks, or is pulled off. |
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I didn't mean to be polarizing but if you're stuck on it, go ahead before this thread heads South. View Quote View All Quotes View All Quotes Quoted:
Quoted: My new sig line if you don't mind! People do seem to be getting charged up in here... we really should try to stay more grounded. |
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Electromagnetic force is one of the fundamental forces like gravity. The attraction is energy that is never destroyed. I’ll blow your mind op. Water, falling downhill, turning a bunch of magnets “creates” energy in the form of electricity. If you realize it doesn’t create energy only transfers it then the lightbulb will go on in your head. View Quote |
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All the small things are looking the same way, spinning the same direction...
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If energy can’t be created or destroyed then that means the energy of the universe is finite and didn’t change. That also means that energy was contained in a singularity that went bang.
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