So you’re interested in a device that can juice a banana with a trigger? Amateur.

First off, we’d need three key parts:

1. An Impactor- This could be like a hammer or a piston. It’ll whack or squeeze the banana to get the juice out.

2. A Reservoir- This is basically a fancy word for a cup or container that’s going to catch all that delicious banana juice.

3. A Trigger- The thing you’re going to pull, press, or smack to get this whole operation going.

Now, here’s how it would work: you pull the trigger, which gets our impactor moving (maybe it releases a spring, or maybe you’re doing the pushing). The impactor then exerts a force onto the banana. Think of the banana like a squishy tube full of semi-liquid stuff (it’s a bit like that, right?). When you squeeze or hit it, the pressure inside increases.

This pressure change, thanks to our good friend Pascal’s Principle, is distributed equally within the banana, causing the squishy inside part (the mesocarp) to be under a lot of pressure. It reacts just like any other semi-fluid thing under pressure - it wants out!

If the impactor’s hit is strong enough, it could burst the banana’s skin (exocarp), which means an exit for the juice. This juice will try to take the easiest route out, which should ideally be into our reservoir. You’d want to engineer the system in such a way (think chutes or funnels) to make sure that you get as much of that sweet, sweet banana juice as possible.

A lot of factors will affect how well this works, like how ripe the banana is, how fast and strong the impactor is, and how well the trigger sets things in motion.

So yeah, it’s doable. Not sure how practical or necessary, but definitely doable!