$3)$ Edit line $61,$ deltap$=0*$direction$,$ and put in the correct form from the Momentum Principle reading. What further information do you need?

$4)$ The force you will use is Coulombs law $($Use $**$ to raise a something to a power. Do not use $^).$ For this simulation assume kC $=10.$

$5)$ Run the code to see if it works. Very important: How can you tell if the code is working correctly? What do you notice about the behavior of the balls at the beginning of the run? Devise a simple test to verify if the code is working and then have your code checked by an LA before moving on $($have them initial your whiteboard$).$

$6)$ There are two groups of balls with opposite charges. Make the positive and negative balls different colors and see what behavior they have with similar and opposite charges. It may be easier to see this if you lower the number of balls and make the radii bigger. You can also lower the average speeds and$/$or increase kC$.$ You can also change their other properties, but do not make the total number of balls larger than $100.$

$7)$ Summarize with your group what you observe at both high and low velocities.