Thermal energy is useful energy. However, thermal energy is usually just heat, and not very hot heat at that. And heat, unless hot enough to boil water is a bit difficult to move and to convert into other kinds of energy. You can't run an electric motor directly off thermal energy for instance. But if you live somewhere where homes needs to be heated as opposed to cooled then thermal energy most certainly can come in handy.
because it can only be used once
Heat, by itself, is unusable. It is the heat difference that makes it usable.
First
Heat energy is, to an extent, unusable energy. If you have a heat DIFFERENCE, you can convert part of the heat energy - but only part of it - to other kinds of energy. That part, you can of course convert to practically any other type of energy.
When energy changes from one form to another some energy gets turned into work or heat. Due to the laws of thermodynamics you can not complete transfer all energy from one form to another without doing work (letting out or gaining heat).
Assuming the ball doesn't rebound: The energy is dissipated. That means it is spread out, as unusable forms of energy; most of it will heat the ball and the ground.
Heat, by itself, is unusable. It is the heat difference that makes it usable.
It becomes unusable energy, for example heat.
First
Heat energy is, to an extent, unusable energy. If you have a heat DIFFERENCE, you can convert part of the heat energy - but only part of it - to other kinds of energy. That part, you can of course convert to practically any other type of energy.
When energy changes from one form to another some energy gets turned into work or heat. Due to the laws of thermodynamics you can not complete transfer all energy from one form to another without doing work (letting out or gaining heat).
The closest law is the Second Law of Thermodynamics. Note that not necessarily "most" energy will be converted to unusable heat, but it is almost inevitable that some will.
Heat energy is, to an extent, unusable energy. If you have a heat DIFFERENCE, you can convert part of the heat energy - but only part of it - to other kinds of energy. That part, you can of course convert to practically any other type of energy.
Heat energy is, to an extent, unusable energy. If you have a heat DIFFERENCE, you can convert part of the heat energy - but only part of it - to other kinds of energy. That part, you can of course convert to practically any other type of energy.
Some of the energy will usually be converted into an unusable form of energy, often as heat.
Energy as such can NOT be destroyed - however, you can convert useful energy into unusable energy.Energy as such can NOT be destroyed - however, you can convert useful energy into unusable energy.Energy as such can NOT be destroyed - however, you can convert useful energy into unusable energy.Energy as such can NOT be destroyed - however, you can convert useful energy into unusable energy.
Assuming the ball doesn't rebound: The energy is dissipated. That means it is spread out, as unusable forms of energy; most of it will heat the ball and the ground.
what happened to the energy that is not stored in your body