The force is still the same on b as on a, because the mass is still hanging down and being pulled by gravity. The force on c is doubled because two of these masses are being pulled by gravity. jcwhit a spring scale only measures the force attached to one of its ends harif Because the scale is acted upon by equal forces in oposite directions, therfore the forces cancel each other out and the result is Zero Newtons. lopezk The tension of one end of the string is mg. Since the masses are stationary, we know that there must be an equal and opposite force providing the tension. That force is the force exerted by the other mass, which is also has a force of mg. Thus the scale must have a reading of mg and not 2mg. zahar In the first picture the scale measures 108N of force with which the object is being pulled to the ground(measuring the tension in a string. In picture C the force measured by the scale should be the same, since both of the objects are not moving towards the ground, while being pulled down by gravity. etasch the scale is holding two 11 kg objects as opposed to one in the figure b; therefore, it is registering twice the weight as it did before. mjctkd Each weight pulls it 108 N in each direction, so the total force is double that: 216 N. hessm The force of one weight pulling on the scale, is balanced by the other pulling on the opposite side. The sum of the forces on the scale, is therefore zero. kml13 For part (b): The mass of the weight is 11 kg. Since force equals mass times acceleration, the force created by the mass is equal to 108 N. For part (c): The weights on each side of the spring scale are equal. However, the spring scale only reads the weight from one side. The other weight is simply holding the scale on the table because it creates the same force as the other weight. lpage The spring scale is only measuring one of the objects, so the force would be the same. dwalker The force is actually being pulled by both m1 and m2, despite the fact that they are pulling in opposite' direction. As in figure (a) the force of gravity is acting on the object giving a force 108 N. Where figure (c) there is a force of 108 N in the opposite direction and the spring scale will read 216 N. rayyala In the first part, the net force will be the weight of the object, so the force will be 108N. smalcolm There are equal forces pulling on the scale in both directions monicad The pulley divides the force in half, because it is pulling down and to the right. Then the force is doubled because there are two weights. This makes the force the same as at the beginning. chown I chose 108 newtons because there are two onjects which would bring the total up to 216 newtons, but there are also two pulleys which I think might reduce the pull. sascott I chose 216N because 108N of force are being applied to each side. shazeeb The two objects are identical, therefore their weight will be equal from both ends of the scale which results in cancellation; thereby being zero. ikhayal The y direction force is the same for b, so the amount of force is the same The force is doubled, because there are two of them causing the force to read twice as much as the previous nberger since there are two weights pulling down together, then the force should be twice as much chalklet Due to the fact that the weighs are the same, so the tension cancels each other becuase the system is at it's equilibruim. bgrigos when holding the scale vertical and the weight hanging below it, one must apply a force upwards equal to 108 N so that the scale and weight do not accelerate up or down. Therefor when one ties another weight to the other side, equal to the first weight, the scale reads 108N. twong since there are equal forces pulling the scale on both sides, the net force = 0. rume Newton's 3rd law.(equal and opposite) iansmith if the same mass is hung from either side of the scale, the forces are equal and opposite, meaning that the scale will read 0 N, because it is just like there is not force on it at all, it is equal on both sides dpitlor According to newtons laws, every force, in this case a tension, is accompanied by an equal an opposite force. The tension pulls at the wall, and the wall pulls back with an equal force. leonadan The wall is stationary and does not put a notable force on the spring so the only thing putting force is the weight. In part C u have two objects both the same mass, so the force is the same. Since there is two of them the scale is doubled force. pjung addition of two forces of 108N jcastle I assume that a pulley takes about 1/2 of the weight off what the scale should read, and therefore be 54 N for diagram A. Since there is double the weight but 2 pulleys, it's 2*54 = 180 N. rabu I'm not really sure if that is the correct answer, my second choices would be 54 and 108. . . i seem to remember a demo in high school and I thought that they cut the force in half, but I'm not too sure and can't remember the properties or rules, so I guess this will have to do. kidcolin In figure b only one object is hanging and it's force is directed down. In part c the two forces are opposite each other so the spring scale is pulled twice as much. erikd I figure that there are 2 weights and you can think of it as one big weight/ juanc Since in figure(b) the force exerted on the wall is a consecuence of action and reaction, in figure(c) the second object is exerting the same force the wall was excerting, making the tension equal to the first figure. tnorton In figure C, 2 seperate 11 kg masses (108N Force) are being applied to the scale at the same time. Each of the masses are applying a force to the scale. Thats why i believe it is 216N. drummel Both masses are equal, thus the force must be double since the wall is not affected by the accelaration due to gravity bdsachs The weight, having been hung off the edge of the table will not at all affect its magnitude. For part C), since the wall is simply giving equal and opposite resistance anyway, there should be ho change if the object giving the opposite resistance is changed from the wall to another weight. mitesht The weight on the left is pulling the scale -108N, the one on the right is pulling it +108N. Sum of the Forces = ma, and since there are only those two forces present, 108 + (-108) equals 0. Net force is 0. ebaker Since there are two 11kg objects, then the tension on the scale is also double. agulsrud You have the weight to the left pulling on the spring in addition to the force of the weight on the right pulling. The two pulling together add up to twice the Newtons gbrun None of the objects are moving so they are each pulling 108 N against each other. dlitvak In figure (b) the only force applied to the scale is coming from the object hanging on one side. That force is 108N. In figure (c) the same force (tension) is applied from both sides so the resulting force is 0 N. manishad the force of the two objects will cancel each other out which will make the scale read zero crivero The scale will meassure the weight of both objects