This is what i dont get for things spinning in circles. So let's say you tie a mass to the end of a string, and you start swinging the string around in a circle with a constant speed. In the absence of air resistance, then the net force on the mass would be the centripetal force provided by the tension, which is directed inward of the circle. Why then, do objects tend to go outward if the net force is inward? For instance, if you used a spring instead of a string, the spring would elongate, but shouldnt the spring compress because the force is directed inward?