Development
Toner sticks to neutral exposed areas
Transfer
Positively charged paper captures toner
22.13 - Interactive summary problem: proton golf
Above and to the right, you see the 24th century
version of golf. Protons in the putter cause the proton
golf ball to move away. Coulomb’s law is well known,
well loved and well used.
To sink the putt in the first game, your putter must
supply an initial force of 1.96×10í^25 newtons. This will
cause the ball to be rolling slowly as it reaches the
hole, overcoming the force of friction due to the grass.
If you apply too much force, the ball will fly over the
hole. The ball is free to move when you press PUTT.
In this game, you cannot move the putter, and you get
only one stroke, but you can play again by pressing
RESET.
The ball is initially 0.200 meters away from the putter and has a charge of +e. What
should the charge be in the putter? You set the amount of charge by specifying the
number of protons.After you calculate your answer, click on Interactive 1 to launch the simulation. You
use the up and down arrows to set the number of protons in the putter. Select your
value, press PUTT and the golf ball will roll toward the hole. If you need to review
how to calculate the repulsive force between two positive charges, see the section
on Coulomb’s law.
The second game is like the game of golf you played at the beginning of this
chapter. You can change both the charge and the position of the putter. You will
almost certainly need several strokes to sink the ball. The challenge of the game is
to do so in as few strokes as you can. Again, the grass supplies a force of friction
that must be overcome. You may feel that you are now more familiar with charges
and the way they behave. Grab your prodigious proton putter and give it another try!Proton Golf Association members at play in the year 2316.(^412) Copyright 2000-2007 Kinetic Books Co. Chapter 22