![]() Again, hold the straw up in the air by its string. Once the straw is balanced tie your first shape to one end of the straw.Is the straw hanging horizontally? If not, what do you have to do to make it hang horizontally? Hold the straw by the string so it is hanging freely in the air. Attach a piece of string to the center of one of your straws. Try to vary the length of string attached to each shape so that they are not all the same. Attach a piece of string to each of the shapes by threading it through the punched hole and tying a knot.Punch a hole into the top center of each of the cut-out shapes.If you like, you can decorate each of them. Carefully cut out the different shapes with your scissors.The shapes should vary in shape and size. ![]() Draw 10 different shapes that you want to attach to your mobile on the construction paper.Ceiling or doorframe you can hang the mobile from (and a chair or adult to help in hanging it).Heavy construction paper or cardstock (various colors work well).Do you think you will be able to balance all the forces within its structure? You will put all of these skills to the test in this activity by making your own mobile. You probably now realize that making a mobile not only requires artistic skills but also some knowledge of physics and balanced forces. This motion creates a ripple effect throughout the mobile structure because all of its pieces are connected. When air moves, however, it can push on the objects hanging from the mobile. Even with two objects of the same mass the rod can be tilted in one direction if one of the objects is farther from or closer to the rod's pivot point than the other one.Ī balanced mobile will be at rest as long as no additional forces are acting on its structure. You might notice that not all of the objects are attached to the rods symmetrically, meaning that they are not equally spaced from the pivot point (or the center) of the rod. It is not only the weight of the objects that matters but also the location on the rod where they are attached. To balance the rod you need a counteracting force of the same magnitude on the other side. If you put more weight on one end of it, gravity will pull the rod down in that direction. When building a mobile it is important to keep each rod's objects balanced so that the rod stays horizontal and is not pulled down in any one direction. On each of these rods there are hanging objects attached with a string. If you look at a traditional mobile more closely you will usually notice that it is made of various horizontal rods. These sculptures are not only artistic, but they are also a great demonstration of balanced forces. Mobiles are free-hanging sculptures that can move in the air. In this activity you will make your own mobile sculpture and find out. When you look at a mobile sculpture you might wonder how it stays balanced-even when it is in motion. These mobiles hang in the air and are usually made up of layers of hanging balanced rods, which, in turn, have objects hanging from them. Have you ever seen a mobile? Not a mobile phone-but a hanging art sculpture? You might have had such a mobile in your room when you were little.
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