Once you start bouncing on a trampoline you will not stop until an outside force (gravity) acts upon it
Newtons 2nd law
This law relates to rotation and flipping on a trampoline and the stronger the force the greater the acceleration = more twist and rotation
Newtons 3rd law
Newton's third law of motion states that every action has an equal and opposite reaction so when you jump on a trampoline you apply a force and in reaction to that equal force the trampoline produces against you.