[Potironette]

Ohh I see. Acceleration needs a force.

Also, if an object were spun in a circle at a constant speed, would there be just a force to the center of the circle or would there be two forces: one to the center of the circle and another to the side?

And an English question: in the above question I used a colon then a question mark. Should I have used parentheses or does it even matter?
Another English question: Between "question mark" and "should," could I haave used a semi-colon?