Understanding Center of Mass: (L/2,L/2)

In summary, the center of mass of the structure can be found by treating the mass of each rod as being located at the midpoint of the rod. Using this approach, the center of mass can be calculated by equating the moments about a chosen point to the total mass acting at the center of mass coordinate. In this case, the center of mass is located at (L/2, L/2).
  • #1
denian
641
0
i don't understand how can the center of mass = (L/4, L/4)
the hint is provided. based on the hint, i would write the answer is (L/2, L/2)


:confused:
 

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  • #2
The center of mass of each rod is right in the middle of the rod. One is at (L/2, 0), the other at (0, L/2). So, for the purpose of finding the center of mass of the entire structure, you can treat the mass of each rod as being right at those points. Where's the center of mass of two equal masses?
 
  • #3
thank you

got it! thanks!
 
  • #4
The way that I approached it was picking the point (L,0) and calculating the moments about this point using the centres of mass of the two separate rods (M*0.5*L+M*L) this has to be equal to the total mass acting at the centre of mass x coordinate (2.0*M*x). x is found to be 0.75*L and we have our answer.
 

1. What is center of mass?

The center of mass is the point where the entire mass of an object can be considered to be concentrated. It is the average position of all the mass in an object.

2. How is center of mass calculated?

The center of mass is calculated by finding the weighted average of the positions of all the individual particles that make up an object. This can be done using the formula: xcm = (m1x1 + m2x2 + ... + mnxn) / (m1 + m2 + ... + mn), where x is the position and m is the mass of each particle.

3. Why is understanding center of mass important?

Understanding center of mass is important because it helps us predict the motion of an object, especially if external forces act on it. It also helps us analyze the stability and equilibrium of an object.

4. How does the position of the center of mass affect an object's behavior?

The position of the center of mass affects an object's behavior in terms of its motion and stability. If the center of mass is not located at the base of an object, it may cause the object to topple over. Additionally, the motion of an object is affected by the location of its center of mass, as external forces tend to act on this point.

5. How does the center of mass change when an object is in motion?

The center of mass does not change when an object is in motion. It remains at the same point even as the object moves, unless external forces cause it to shift. However, the position and orientation of an object in motion can affect the motion of its center of mass.

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