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Center of Gravity

Center of Gravity. Center of Gravity (COG). Definition--The Point located at an object’s average position of the weight In other words…. The center of an object’s weight Symmetrical object’s, like a baseball the C of G would be in the exact center of object

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Center of Gravity

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  1. Center of Gravity

  2. Center of Gravity (COG) • Definition--The Point located at an object’s average position of the weight • In other words…. The center of an object’s weight • Symmetrical object’s, like a baseball the C of G would be in the exact center of object • However other oddly shaped objects will find COG in any number of positions, depending on weight distribution • COG

  3. C.O.G. • When objects rotate freely they must rotate about an axis through the COG • Basically treat the object as if all its weight is concentrated at that one pt. • In class demos…

  4. C.O.G. --Balancing • For an object to balance, and not topple… support must be directly below C.O.G.

  5. Where C.O.G. is located • Generally found in the middle of all the weight… • Does not even have to be within, the object itself • Ex. boomerang • Will be located toward one side of an object where most of its mass is focused… • Ex. Weebles COG gravity

  6. Weebles Wobble, but they don’t fall down??? • Weebles have very low COG • Whenever rolling it will roll to a stop when its COG is as low as possible • This occurs when it is standing upright • Also occurs for inflatable toy clowns • Objects with a low COG are less likely to topple because of this principle • Higher COG is, the easier to topple

  7. Balancing Stuff • Again, all that has to happen to balance, is for a support to be directly beneath COG

  8. Advantages of low COG • Athletic advantages • wrestling—harder to takedown • Football • Both easier to drive power through their legs • SUV’s …. Tip over all the time b/c COG is too high • SUV • Farmer’s tractors • Much more control in all vehicles w/ low COG

  9. Animals • Low COG High COG • Low COG High COG

  10. Humans - Where is our COG? • Just below our belly button • Notice, support always below COG • Bipedalism?? • Only mammals w/ this ability to walk on 2 legs • Because of Evolution and how our legs changed to balance between steps is why we are only mammals to walk

  11. Robots – Where is the COG? Where is this robot’s Gravity “Average Mass” Centered? B A C

  12. Robots – Center of Gravity Is this robot’s gravity more centered at it’s starting point “A,” or in it’s current position, “B?” How do you know? A B

  13. Robots – Center of Gravity How has the builder of this robot considered centering the gravity for the task that it has to accomplish?

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