In this experiment, a suspended metre-ruler lies in a series of equilibrium under non-parallel forces.
The apparatus consists of the following. A metre rule suspended by strings which make an angle with the vertical. The strings run over pulleys which are clamped in retort stands. Slotted masses M are tied to the other ends of the strings and so a tension T = Mg is maintained in each string. Other slotted masses m are suspended by string tied centrally on the metre stick. Let the mass of the metre stick itself be n.
The Attempt at a Solution
I've setup the apparatus as required but I've been encountering a few issues. I've fixed the pulley as high as it can go on the retort stand. I've kept the distance from the string tied around on the metre stick to the stand around 10 cm on each side. It then says to place 600 g as M on both sides but says nothing about the mass in the centre m. When I place more than 300 g as M on both sides, the metre rule starts moving and reaches its maximum height and stops as it can't go any higher. So my first issue is I can't get it to 600 on both sides.
Secondly when I start adding weight in the centre as m, nothing happens. There's no gradual change in the setup moving downwards. And then when m reaches a particular mass, it just drops downwards.
The change in vertical length upon adding m is directly proportional to the mass m added but it doesn't seem. I've attached a picture of the setup.
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