friction force

It was this detail that contributed to the turning point for basketball, making it widely developed today.

Regardless of the shirt of the tens of thousands in the market or a few million in the shop, the result will still be these horrible hate holes after all.

Dice to add random elements to the above games, and we also believe that the other dice blocks give completely random results.

The reason to explain why the smooth tape is still a mystery, because ice doesn't always follow a certain rule.

A new study shows that, although snakes do not have legs, they have creative ways to avoid falling when climbing a tree by using the body's scale and muscles to increase friction