Javier, Las dos respuestas que te dieron arriba están correctas, pero te voy a dar los equivalentes en español para aclarar cualquier duda. Jammed es estar estancado por acumulación. Mientras que Stuck puede ser estar estancado por acumulación o bien por otros factores... Por ejemplo: Si estás en un embotellamiento puedes usar ambos, porque estás estancado por acumulación de coches. Lo mismo pasa su dices que estás estancado en la entrada del estadio porque hay mucha gente queriendo entrar, puedes usar los dos. Pero si estás estancado en la entrada, no por la acumulación de gente, sino porque el guardia de la entrada no te deja pasar, entonces ya no puedes usar "jammed" porque la causa de tu estancamiento no es acumulación, sino otro factor... en ese caso sólo puedes usar "stuck". Lo mismo pasa si estás leyendo un libro y hay un capítulo que no entiendes, puedes decir "I am stuck in this chapter", no podrías usar "jammed" porque lo que tiene detenido no es la acumulación de libros o palabras, sino el no poder entender algo. Espero haberte ayudado.

Fine until the end. I would write "clog" instead. A jam could involve traffic or it could be two dinner dates for the same evening. I would be in a jam and I might get stuck eating two meals. A porcupine might stick me with one of its quills and again I would be stuck. I am not stuck on the answer but I could be in a jam if I make too many typographic errors.

Hi Javier, There is a very specific difference between these two words. 'Stuck' means something is unable to move or to be moved. It can be 'stuck' in a variety of ways - a car may be stuck in mud, you might become 'stuck' in your job, something may be 'stuck' to a wall purposely (like a poster), or a piece of paper might be 'stuck' in a printer. Jammed, on the other hand, is a very specific type of 'stuck' - it means to be 'stuck' mechanically, and it usually means to be stuck between two things. An object that is 'jammed' is forced into a space that is too small for it to pass through. It can describe the object or the space: the printer can be 'jammed,' meaning the paper is stopping the printer from working, or the paper can be 'jammed' into the printer. You can 'jam' the wrong key into a lock, and it won't come out. Then the lock is 'jammed'. I hope that helps! If all else fails, you can safely use 'stuck' without specifying.

Jam and stuck can be synonyms and also can be used in ways that have no relation at all. As your printer example suggests, they can both mean that something cannot move or work due to something being in the way or something is holding on to it. There are, however, different uses for these two words. It sounds to me that you have a clear understanding of the meaning and how to use them. Good job! Also I think I would say "clog your arteries;block your arteries" instead of "jam your arteries"