Newtonian inertial momentum conservation principle in physics, believed that high school are familiar.

With hand will a ball from side side filed diameter maximum points level Yu addition 4 a ball Shi release hand (filed two a, and three a ball, see not as of effect, fun unlimited variety play, see Pro of imagine force has yo) you on will found, only 1 star ball will back and forth swing; if is 2 star ball words, 2 star ball will natural swing without electricity on can let ball by force uniform swing, is in boring of when sent time of a small process.

Derived function is when you can't sleep, you will not feel pain? If you're only counting sheep, feel so childish? Then please try this use, Grill on the table, and collision with the ball and move their eyes, not how long you sleep!!!

And don't forget to play it brings another kind of feedback, which is fun.

Law of momentum conservation definition: If a system is not affected by external forces or the forces sum to zero, so the total momentum of the system remains the same.

Would also like to note here because under this subsection is the sphere of the law of conservation of momentum

Collision course under the influence of air resistance will gradually stop swinging the ball, please do not

Said believes the market could swing that is not the reality of the eternal inertia swing if you want to practice

Forever is now needed in a specific environment will it be possible to achieve it!