Assignment Task:
Task:
Experiment 5 1 Smartphones in Free Fall
Equipment: o Tape Measure o String o Scissors o (I) 10S or Android Smartphone o Physics Toolbox Sand Mite
Introduction
The farming lab is m adaptation of an experiment published in P Vogt and d. Kuhn, “Analyzing Me fall with a smartplione acceleration miser,” The Physics Teacher 50 (3), 182-183(2012). This experiment will demonstrate how a smartphone cm be used m an accelerometer M the context of laws &writing free fall. The a, Physic. Toolbox Sensor Suite (see Fig. 5.1c) will be nerd together with an iPhone or Android device. The values measured by the smart-phone can then exported to a SpreqUiSiWel appliimion (Micnexift Excel u amilable w a part of Microwort Office, which current students can download for free while enrolled at UConn, provided by KITS at lettpat//softvare.sconn.eds/microsoft-producsa-scudense/) for analysis. Before performing this experiment. it will he houefirial to ftindameiMlly inderstrind how acceleration sensors work. Smarlphone mceleration Sellsors are micros-stems that process eleetriml and meehaniml information, and are apt ly mmed miermeleetromechanind sysMns (MEMO). In the dipping ewe, an amelermion respire minims of a mew designed to stistain vibrie tions that is mounted on spiral springs and cm therefore mom freely in one direction. It as acceleration a taken effect in this direction. it veto the nags al to move by the distance h. Xlsis change in position can be measured with piworesistive, piezoelectric. or capacitive methods and ki meawromont of the current moderation. he mutt caws, however, the immurement is made capacitively. Fig. 5.11, thW8 a simpli-fied design of n (Amen( of this kind: throe sheets. which ere plans] parallel to oath other and 001111.011 With spina Springs, make up wrier COMIttili011 of two capacitors, The two outer sheets fixed: the middle shirt whirl] forms the vibrating mars. is able to moor freely in 011e direction. Acceleration causes the distance IMneen the sheets to shift, leading to changes in celerity. These are 17.1.1111Ni And mitVerterl into an ameleration wine Strictly speaking. they are therefore hot moderation sensors but force sensors. Although this mity be a difficult miteept to understand, it is eery important for this lab that we provide ant with information cm the way tuneleration masers function_
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Get Help Now!(a) Figure 5 i Free fall with 1113 iPhone: (a) Experiment, setup showing the orientation of the three independent acceleration sensors of nn iPhone and acceleration process, the sensors measure the accelerntion in the dare.mn of the three plated Dreign and mode of operation of acceleration sensors. (c) Presentation of measurements prior to the export of data from the iPhone into Excel.
is bemuse, upon performing this experiment for the first time, you will perceive the device s.pauling niotioulren from a string and HMI falling. accelerating to the floor. In addition to this information provided, your petmonl previous experience of bring paused to the floor in an elevator .rederating downwards. and the rivaling COMI11.11011 that one is wreghtlere to a frerefolling lift. can also help you to understand this process. Ton ei.. acceleration ihreevrenit.111.1VY to be included in n phone. Three Three sensors have to be petitioned orthogonally to each other and determine the revelerntion og, and n, 011.11 Hirai, direction (oh. 9-, and independregly (see Fig. 5.1a). In this lab exlydment, we will exaridne free fall h5 suspending the smart photo spade down by hand and dropping it to start the fall (see Fig. 5.1a). In order to avoid honaging the dacha place n soft Offset (e.g., a pillow or cushion) under the smartphone for it to land on. After having tinned the mennmement of acceleration with the highest measuring frequency (ION H. for iOS And 501) Ha for Android), we release the photo and the free fall recurrences.
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