Instead of continually tapping the ball with the rod you can drag the rod across the wand to accumulate more charge. Try it. Question 7 Explain how dragging the rod makes a difference in leaving more charge. Why didn't all the charge on the rod transfer to the ball when you tapped it

the body's situation won't change the forces are equal opposit and on the same body

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me