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Zarich12
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Is there a relatively simple way to find the center of gravity of an object? I need to know to see if my model rocket has a high center of gravity. The bulk of he weight is in the bottom.
I wouldn't think it would matter because the torque is proportional to the radius from the pivot point AND the sine of the angle. If the center of mass was higher, the radius would increase but the angle would decrease.Zarich12 said:Ok. One mor question. If that same rocket is too tippy in the air, does that mean it has a high or low center of gravity. I think it's high, but just wanted to check.
The motor thrust is acting against the bottom of the rocket (obviously but needs to be said). This is like balancing it on your finger but with no 'skill' to help it stay there. Having the CM as low as possible will make it less unstable. Until is actually gets moving, it will be tending to fall over. Space rockets have complicated servos to keep them upright for the first bit of the ascent. Once the rocket builds up some speed, the aerodynamics (fins and stuff) will keep it 'flying' straight so the better the initial acceleration, the better. It's a race to get it fast enough before the tipping becomes significant.Zarich12 said:Look, I understand most of what you just said but some of it went right past me. I'm 13. To answer your last question, yes, it does change greatly. If the ballance of this model rocket is off by just a few tenths of a ounce, the rocket will tip over. It will also do so if the center of gravity is too high. Then the rocket loses vertical distance because it uses it's burn time to fire horizontally. I just want to make the most of the 0.7 seconds of firing time the motor has.
My bad. A better explanation would be that a measure of tipiness is the angular acceleration, which is basically how fast the speed of angular movement changes. This value can be related by: [tex]\alpha = \frac {\tau} {I}[/tex]Zarich12 said:Ok. One mor question. If that same rocket is too tippy in the air, does that mean it has a high or low center of gravity. I think it's high, but just wanted to check.
The center of gravity of an irregularly shaped object can be determined by suspending the object from different points and finding the point where it balances. This point will be the center of gravity.
The center of gravity is important in physics because it is the point at which an object's weight is evenly distributed in all directions. This point helps determine an object's stability, balance, and how it will respond to external forces.
Yes, the center of gravity can be outside of an object. This can occur in objects with irregular shapes or objects that have varying densities throughout. In these cases, the center of gravity may be located in empty space.
The shape of an object can greatly affect its center of gravity. Objects with a wider base and lower center of gravity are generally more stable than objects with a narrow base and higher center of gravity. Additionally, objects with more uneven distribution of mass will have a more complex center of gravity.
The center of gravity can be used in everyday life to determine the stability of objects, such as in construction and engineering. It is also important in sports, where athletes must maintain a low center of gravity for balance and control. Additionally, understanding the center of gravity can help prevent accidents, such as tipping over a ladder or furniture.