Aball is rolling across the floor. how could you apply an unbalanced force to change the speed or direction of the ball?

By pushing the ball in the same or another direction. Or by stopping the ball altogether. 

Ifound this on google i hope it you

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )