E205 tenedero

# E205 tenedero - ANSWER TO QUESTIONS 1 What happens to the...

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ANSWER TO QUESTIONS 1. What happens to the value of the force constant as you increase the force applied to the spring? The value of the force constant would increase as the force applied to the spring increases because the two variables are directly proportional. However, it is not true experimentally because the value of the force constant decreases as the force applied was increased. This is because of the effect of the displacement that as it increases it also affects the value of the force constant. 2. Is Hooke s Law applicable to bodies other than springs? Give an example. Yes, Hooke s law is applicable to other bodies other than a spring. Earthquakes and faults are bodies wherein Hooke s law is applicable. Tectonic plates moving over hundreds of years build up tectonic stresses. These tectonic stresses slowly deform the crustal rocks and build up elastic energy when they are deformed by differential stress. When the resistance is overcome, it springs back like a spring and results to an earthquake. 3. A spring stretches 0.20m to a force of 800N. How much work must be done when a 20 kg mass hangs vertically from the spring? F = -kx 800N = -k ( 0.20 m ) k = - 4000 N/m By ratio and proportion, x = (0.20m)(9.8m/s 2 )(20kg) / (800N) x = 0.049 m W = (1/2)kx 2 W = (1/2) ( -4000 N/m ) ( 0.049 m ) 2 W = -4.802 J 1/5

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INTERPRETATION OF RESULTS In the first part of the experiment, we were tasked to determine the spring constant of a given spring. The deformation of the elastic spring obeys Hooke’s law which states that “Within the elastic limit of a body, the deforming force is directly proportional to the elongation of the body.” In part 1A,
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• Spring '16
• Force, Robert Hooke

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