The toy car starts moving because it has acquired energy from the winding action, which enables it to do work and move.
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The unit of energy is the joule (J), which is the amount of energy required to do one joule of work.
The second object receives the energy, may move, and performs work, demonstrating the first object’s capacity to do work.
An object with energy can exert a force on another object, transferring energy to it, causing it to move and thus do work.
The object doing the work loses energy, while the object on which the work is done gains energy. This illustrates the transfer of energy between objects.