Liquid in accelerated motion Carl-Olof F¨ agerlind 1 and Ann-Marie Pendrill 2 1) Krusb¨ arsv¨ agen 4, SE 168 59 Bromma, Sweden 2) National Resource Centre for Physics Education, Lund University, Box 118, SE 221 00 Lund, Sweden E-mail: [email protected] and [email protected]Figure 1. A glass of cordial, resting on wooden triangle on a string Abstract. What happens to a liquid in a swing or a loop? Accelerated motions lead to effects that may seem surprising. Consider a liquid in a glass placed on a wooden triangle, in turn attached to a string and moving fast in circle a vertical plane. The surface of the water remains parallel to the bottom of the glass - and orthogonal to the string - as long as gravity and the tension in the string are the only forces acting on the triangle. A key to the understanding is that the tangential acceleration of the liquid, the glass and the triangle, are all identical to the tangential component of the acceleration of gravity. This is an author-created, un-copyedited version of an article in Physics Education 50 648 (2015). IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://iopscience.iop.org/article/10.1088/0031-9120/50/6/648/pdf
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Liquid in accelerated motion - fysik...Liquid in accelerated motion 3 an inch or so of coloured liquid in a closed bottle with a string will also do [1]. 2. Force and acceleration
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Liquid in accelerated motion
Carl-Olof Fagerlind1and Ann-Marie Pendrill2
1) Krusbarsvagen 4, SE 168 59 Bromma, Sweden
2) National Resource Centre for Physics Education, Lund University, Box 118, SE