Hi guys i have a rather weak concept on circular motion so i wish you guys can help me. As you know when something goes round in circle, there is a net force towards the center right? If that is the case, why this force doesn't push the particle to the center causing it to spiral towards the center? Secondly, why does planetary motion around the sun elliptical? Why can't they go round the Sun in circle? Lastly this has got no connection with circular motion but rather a though i had when youtubing some video. Some guy in some video on youtube said that if we were to take a marble to represent the nucleus of the atom and a strand of hair to be the electron, their distance would be 20 miles apart. If this is so, why are we able to hold things? Wouldn't the space between the nucleus and electron be too big??