Electric Field Hockey Lab

Briefly explain your strategy. My strategy was to push the puck below the barrier and then pull it back up just as it passes the barrier, Briefly explain your strategy. My strategy was to push the puck below the first barrier and then pull it back up before the second barrier, then push it pass the Eric Wesnofske Part I: Charge Interaction Electric Field Hockey Lab PHY202 Open simulation at https://phet.colorado.edu/sims/cheerpj/electric-hockey/latest/electric- hockey.html?simulation=electric-hockey Beginning Observations : 1) Open the Electric Field Hockey simulation. Play around with the controls, what can you change about the simulation? I can change the mass of the puck, can add positive and negative charges. I can also add barriers to the simulation. 2) What happens when you put a positive charge near the hockey puck? The positive charge will push the puck away from the charge. 3) What happens when you put a negative charge by the hockey puck? The negative charge will the puck towards the charge. 4) What happens when you change the mass? The smaller the mass the faster the puck will move, the larger the mass the slower the puck will move. Level 1 5) Master level 1 by getting the black hockey puck into the goal. Draw what your screen looks like in the space below. Level 2 6) Master level 2 by getting the black hockey puck into the goal. Draw what your screen looks like in the space below. 7) Did you have to modify your strategy from Level 1 in order to master Level 2? Were you able to use all the same charges or did you have to use different types of charges? Explain why. I did have to modify my strategy since there were 2 barriers instead of one. I just had to use extra charges. 8) How did you use your knowledge of Coulomb’s Law to master Levels 1 and 2?

It helped me master levels 1 and 2 because I knew that the same charges repel each other and while the opposite charges attract each other I was able to use the knowledge to help navigate the puck around the barriers.

Part II: Charges and Electric Field Open simulation at https://phet.colorado.edu/en/simulation/charges-and-fields . In this simulation, the model is a bit different: the little yellow “E field sensors” are like the hockey puck but they are on a high friction surface, so they stay in place allowing for measurements. Collect data by turning on “Show Numbers” and “Tape Measure.” 1. Determine the relationship between distance and the strength of the electric field around a charged body. Use Excel to document your data, graph the data you gather, and determine the equation for the relationship (attach your data table and graph to this lab). What equation did you find? V/m Distance 58.2 37 12.1 82.5 4.61 137.2 2.45 189.9 1.55 238.3 2. Determine the relationship between amount of charge and the strength of the electric field around a charged body. Use Excel to document your data, graph the data you gather, and determine the equation for the relationship (attach your data table and graph to this lab). What equation did you find? V/m Voltage 58.2 22.9 12.1 10.5 4.61 6.4 2.45 4.7 1.55 3.7 3. Write an explanation of how you can predict the motion of a charged hockey puck that is moved by other charged pucks. Explain using examples and drawings that include: a. How to use free body diagrams and vector addition. A free body diagram is used to represent the forces on an object and used to understand the energy and directions of force. It helps some understand how the object is moving. However, using vector addition uses math with their given variables to solve a problem. b. Comparing and contrasting positive and negative charges. If a charged puck is in play, and another puck comes at it with an opposite force it will be attracted to it. Depending on speed and momentum they might collide. In opposite effect, if a similarly charged puck is in the area it will be repelled. The two charges can cause the puck to travel a path around a opposite charge. The puck would be pulled into the force of the opposite charge. And with the similar charge it would repel. 0 50 100 150 200 250 300 0 10 20 30 40 50 60 70 58.2 12.1 4.61 2.45 1.55 f(x) = − 0.24 x + 48.36 Distance and Strength of Electric Field Distance (cm) V/m 0 5 10 15 20 25 0 10 20 30 40 50 60 70 58.2 12.1 4.61 2.45 1.55 f(x) = 3.02 x − 13.36 Voltage and Strength of Electric Field Voltage (V) V/m

4. Explore the relationship between energy and fields. An object is placed in a field and released. Explore with the simulation. What energy changes are observable or measurable? How do you know that? When a positive charge is placed in a field the force is repelled. When a negative charge is placed in the field the force is attracted. 5. What does the conservation of energy principle imply about these energy changes? It implies that there is always energy there in the field, the charges may alter the direction of the energy.