# Questions tagged [energy-conservation]

The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.

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### Misunderstanding these particular energy transfers

Given 2 identical iron bars “A” and “B” in deep space. At some distance from them are 2 coils. “A” is moving with constant velocity “V”, “B” stands. Same currents pass through the coils separately, ...
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### Fields and Conservation of Energy

I am a bit confused about fields, like magnetic fields, and the conservation of energy. For example, when two magnets are attracted to each other, don't they "exhaust" the field? The moon that orbits ...
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### Kinematics problem, only energy related approach [on hold]

I read this question: From the top of a tower, a stone is thrown up and it reaches the ground in time $t_1$. A second stone is thrown down with same speed and it reaches the ground in time $t_2$. A ...
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### If the first law of thermodynamics ensures conservation of energy, why does it allow systems to lose energy?

I am learning the basics of Thermodynamics. Everywhere I read about the first law, it states "conservation of energy", and talks about how change in internal energy equals heat and work transfer. I ...
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### Buoyant force of tides and conservation of energy [duplicate]

Imagine an electric power generator in a form of a floating object moving up and down and utilizing the buoyant force of sea tides. Can anyone explain how it doesn't violate the principle of ...
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### Mechanical energy conservation

Is the mechanical energy conserved when the speed is constant? What if we have a charge that entered an electric field due to an external force -which is making a dynamic equilibrium with the ...
65 views

### Will momentum be conserved in case of electrostatic force?

If a charged particle approached another particle of same charge held by some external force, then by coulomb's law the particle will start electrostatic repulsion. Thus coming to a closest distance ...
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### Verify Conservation of energy for variable gravitational field [duplicate]

Remember we can verify conversation of energy in gravitational field when we take g to be constant When we leave body from H At a point h As potential energy is mgH -mgh Kinetic energy. ...