Determining Maximum Distance Using Center of Mass

In summary, the conversation discusses the center of mass and its relation to the distribution of mass on a system consisting of two blocks of equal mass and length. The participants determine that the center of mass must be on the edge and that the mass hanging over the edge is equal to the mass on the table. They also determine that if half the mass is hanging over the edge, then half of the total length is also hanging over the edge.
  • #1
UrbanXrisis
1,196
1
question is http://home.earthlink.net/~urban-xrisis/clip003.jpg

I'm guessing that the center of mass has to be in the edge. I'm not sure how to set it up so that I can find the most distance. any ideas?
 
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  • #2
the CM of the system is definitely on the edge. The blocks on the table are of equal mass and length, if the CM of the system is exactly on the edge, what do you know about how much mass is on the table relative to how much total mass there is?
 
  • #3
they should be equal?
 
  • #4
The mass hanging over the edge = The mass on the table, the center of mass of the whole system is on the edge means the mass to the right balances the mass to the left. If both blocks weigh the same, the only thing that isn't symmetric is the position of L. if half the mass hangs over the edge, then how much of the total length hangs over the edge? (they are the same mass, length, and density)
 
  • #5
total length is 2L so half is hanging off, that means the length of L is hanging off?
 
  • #6
No, total length means the length from the leftest point on the lower block to the rightest point on the right block. If half the mass is hanging off and half is on, then how much of the length is hanging off? They are uniform blocks.

Try simplifying the system to just one block and figure it out that way.
 
  • #7
3L/4?
is that it?
 

1. How is the center of mass used to determine maximum distance?

The center of mass is a point in an object or system where the mass is evenly distributed. By calculating the center of mass, we can determine where the object is most stable and therefore, the maximum distance it can be moved without losing its balance.

2. What is the formula for calculating the center of mass?

The formula for calculating the center of mass is:
Center of mass (x) = (m1x1 + m2x2 + ... + mnxn) / (m1 + m2 + ... + mn)
Center of mass (y) = (m1y1 + m2y2 + ... + mnyn) / (m1 + m2 + ... + mn)
Where m is the mass and x,y are the position coordinates.

3. Can the center of mass be outside of the object?

Yes, the center of mass can be outside of the object. This can happen when the object has an irregular shape or when the mass is unevenly distributed.

4. How does the center of mass affect the stability of an object?

The lower the center of mass, the more stable the object will be. This is because the weight of the object is concentrated closer to the ground, making it less likely to topple over. Objects with a higher center of mass are more prone to tipping and falling.

5. Are there any limitations to using the center of mass to determine maximum distance?

Yes, there are limitations to using the center of mass. This method assumes that the object is rigid and does not take into account external forces such as wind or friction. It also assumes that the object's weight is evenly distributed, which may not always be the case.

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