have to slow down. so if you want to move the ball from far away to close in, you need to first slow down and then speed up! it’s not a very easy thing to do, is it? that’s why you have such a hard time keeping the ball in one place. this is called an unstable system. another example of an unstable system is when you balance a broomstick on your palm. you can do it, but it takes constant attention and concentration.
when you ride the merry-go-round at the carnival, do you feel more force pulling on you if you ride close to the center or close to the 