The X-Challenge

Are you ready for the X-Challenge?

Challenge your friends to solve this simple puzzle and wait to see their faces when you reveal the mind-blowing solution.

The goal is simple, separate the two bars.
The solution is going to BLOW your mind, trust me, nobody is going to figure it out.
Printing parameters:

The 4x bars must be printed with a inFill > 90%.
No support needed.
SOLUTION (DONT READ IT IF YOU WANT TO TRY FIRST):
The X is locked by 4 hidden bars (one in each side). Every move you make is moving the bars at the center and making it impossible to separate the blocks.
Have you ever heard of centrifugal force?
That's right! The only posible way to unlock the X is......to spin it!
Just put it on a table, spin it and separate it!
But shhhh keep it a secret.

Post-Printing

Once you have blocks(2x) and bars printed, you have to put one bar inside the small block, and then use glue on that small block to stick it parallel with the long block.

Overview and Background

Centrifugal Force
This puzzle will only be resolved using centrifugal force, so it's a good approach to see how it works.

Lesson Plan and Activity

Activity about Centrifugal Force
First give the puzzle to the student and challenge him to resolve it.
Later, the teacher explain to the student how the centrifugal force works and ask him to try again.
If the student doesn't get to resolve it, the teacher can unblock and separate the pieces of the puzzle to show him how it works.