Experiment 2 The Spring Force Scale Before you begin an experiment using the spring scale you may need to calibrate it In this experiment you will become familiar with how to calibrate and use the spring scale Materials Mass Set Roll of Masking Tape Box of Modeling Clay Single Hole Punch 5 N Spring Scale 10 N Spring Scale Stopwatch Procedure Calibrating a Spring Scale 1 Hold the 5 N spring scale by the handle so that the measurement readings are right side up This should leave the hook hanging from the bottom 2 Observe the plunger the plastic piece hanging from the spring as you gently pull and release the hook The top of the plunger that looks like a flat circular piece is called the indicator 3 To calibrate the spring scale observe the position of the indicator on the measurement scale The indicator should rest at 0 g or 0 N when no force is applied i e the hook is not being pulled on by anything 4 If the indicator is in any position other than zero when at rest adjust it by twisting the plastic bolt at the top of the spring scale until the indicator rests at the measurement 0 g or 0 N 5 Repeat Steps 1 4 with the 10 N spring scale Weighing a Mass 1 Calibrate the 5 N spring scales if necessary 2 Hold the spring scale upright by the metal handle and hook the stopwatch onto the spring scale hook so it freely hangs 3 Observe how far the indicator moves on the measurement scale and record the mass in Table 2 4 Determine and record the uncertainty in Table 2 5 Repeat Steps 1 5 using the 10 N spring scale 2014 eScience Labs LLC All Rights Reserved 6 Repeat Steps 1 6 for the box of modeling clay roll of masking tape and single hole punch Table 3 Spring Scale Measurements Object 5 N Spring Scale Weight g Uncertainty g 10 N Spring Scale Weight g Uncertainty g Stopwatch 30 00 g 5 00 g 40 00 g 10 00 g Single Hole Punch 50 00 g 5 00 g 60 00 g 10 00 g Masking Tape 70 00 g 5 00 g 60 00 g 10 00 g 5 00 g 460 00 g 10 00 g Box of Modeling Clay 450 00 g Post Lab Questions 1 What are the advantages and disadvantages of using a spring scale to measure weight The 5N spring scale s margin of uncertainty is half that of the 10N spring scale The measurements of the 5N spring scale are also closer to the actual mass of the object 2 What are sources of uncertainty when using a spring scale calibrated the scales incorrectly or could have read the measurement incorrectly Uncertainty could have also arisen if the objects were altered in any way or if they did not hang in the same position on both scales 2014 eScience Labs LLC All Rights Reserved
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