The diameter and length are used to control the force applied.
This type of change stops, according to Aristotle, when the force applied has been removed.
I would put the balls into a vice or some kind of press where you can measure the force applied to the ball.
The forces applied to a tendon may be more than 5 times your body weight.
The same force has applied more recently to the various countries of the European Union.
So it can serve to control the force applied.
That is, a given force applied to an object will result in the same acceleration whether on the earth or the moon.
Once the forces are no longer applied, the object returns to its original shape.
Somehow it counteracted the force applied, they couldn't say how.
They measure the forces applied to the ground by the feet of a running animal.