<p> Electric Field Hockey (Phet)</p><p>Go to phet.colorado.edu and click on “play with sims.”</p><p>Playing Electric Field Hockey 1. Click on the category named Electricity, Magnets, & Circuits, then find Electric Field Hockey, click on it, then select Run Now!. 2. Start with difficulty level 1. Place up to 10 + charges and 10 – charges in strategic locations to help push/pull the hockey puck into the goal. When you get it, make sure the trace is showing, then either use Print Screen to take a picture of your solution or carefully draw the barriars and your set up on another piece of paper (include the trace).</p><p>3. Repeat for difficulty level 2.</p><p>Level 3 is extra credit.</p><p>Post-Game Analysis</p><p>1. Which direction do electric field lines point for positive charges?</p><p>2. Which direction do electric field lines point for negative charges?</p><p>3. What do the direction and strength of the field lines indicate for the (positively charged) </p><p>“puck?”</p><p>4. Did the (positively charged) puck always move in the same direction as the field lines it was </p><p> passing over?</p><p>5. What happened (or would happen) if you changed the charge of the puck from positive to </p><p> negative? 6. What happened when you increased the mass of the puck?</p><p>7. How did the distance between the puck and the particles affect the motion of the puck?</p><p>8. List two or three cool things you got the puck to do. Why did each one happen?</p><p>9. The field lines on the program are evenly spaced, with darker shades of grey indicating a </p><p> stronger field. This is a very clear way of presenting this information. However, it is not what </p><p> we will normally use. Why do you think that is? If you enjoyed this, you can find many more simulations at phet.colorado.edu</p>