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.
These examples show that objects can acquire energy through different means (winding, pressing), enabling them to do work (moving, changing shape, exploding).
If a balloon is pressed too hard, it can explode, releasing the stored energy rapidly and producing a blasting sound.
The balloon changes shape when pressed but returns to its original shape when the force is withdrawn, demonstrating its elastic potential energy.