In this activity the leaming objectives are: 0 Measuring extension and force using a program 0 Recording and explaining data for springs using Hooke's law o Recording and explaining data for springs connected In 'paraliel' arrangements Extra Challenge: ' 0 Describe and explain the relationship between elastic energy stored and extension in a spring. 0R set up an investigation of your own ' The website you need for this is anal. Simulations (University of Colorado) httgsd'i'phet.colorado.eduienlsimu|ationsicategoiphysicslmotion 0n opening the program. click on INTRO EXPT 1 Using one spring of force constant 200mm You will need to click on 'values' to take measurements of displacement (extension) from equilibrium. You can make the applied force positive or negative, it just changes direction. nothing else. Start at a random force. and increase by the same amount each trial. Note that the max it 100 N of force. so you cannot increase by more than 20 N. Example: 6, 12. 18, 24. 32 or 35, 40. 45, 50. 55 or 20. 40, 60, 80. 100 You see the trehd 1) Describe the pattern in your results. How is the force applied related to the extension? Give examples from the data you have taken 2) Draw a graph of Force Vs. Extension. Where the x-axis (horizontal) will be the force and the y-axis (vertical) will be the stretch. 3) Describe the direction of the applied force on the spring AND the spring force on your diagram. Why are they in the directions shown? What does this tell you about equilibrium? EXPT 2 Using Mg springs of force constant 200mm in parallel (side by side) On the main menu (look to the very bottom of the screen) 90 to SYSTEMS. Vary the applied force and record the extension or displacement from equilibrium. NOTE: Use the same force values you used in Experiment 1. 4) Graph this as well. Now you have two graphs". You will make a third graph with BOTH data sets on it so you can visibly compare the two. 5) Explain the main difference in the extension produced by this 'spring system' compared to the system in Em; 1