F = mg = k(x-Xo) dassea and Spiga PHET Part 1: Find the value of the Spring Constant, k Set up as above: Note the natural length of the spring (marked by the dotted line) Set the Spring Constant as shown Gravity = Earth Damping - 0 When a weight is attached to the spring. the green arrow represents the Displacement or stretching of the spring (X-Xo). (i) For 8 masses between a range of 50g to 300 g. measure x-X [ii) Convert the mass from g to kg and convert the length from cm to m (iii) Make a Data Table (Mass, X-Xo, Force (mass x g] (ii) Plot Force (mug) on y-axis versus X-Xo on x-axis, Include Title, labels and units (note g is the acceleration due to gravity on Earth) (iv) Get the value of k from the slope of the graph, Unit (N/mm) I.I DO PHET