Sunday, June 28th 2009

CrossFit Kids - Skill Day

CrossFit Kids action

CrossFit Kids - King of Prussia

Today, play on the bars. Practice pull overs, roll overs and kips.

Skill Day Brain Teaser:
A man is wearing black. Black shoes, socks, trousers, jumper, gloves, and balaclava. He is walking down a black street with all the street lamps off. A black car is coming toward him with its lights off too, but somehow manages to stop in time. How did the driver see the man?

Skill Day Puzzle:

CrossFit Kids action

At first glance this structure seems impossible to build. After all it would collapse before many of the bricks (or in this case, dominoes) were laid. But the bridge is actually easy to construct if you approach it with the right frame of mind.
(From The Big Book of Brain Games)
Posted by Jeff Martin on June 27 2009 at 08:27 PM

Comments:
  1. I guess the sun was up because you never said that it was night
    Posted by brewer  on  June 28 2009  at  08:32 AM
  2. Good job Brewer! Now can you figure out how to build the domino bridge?
    Posted by Jeff Martin  on  June 28 2009  at  09:27 AM
  3. A) build it upside down
    b) build it complete except the vertical posts and then lift it onto the posts.
    Posted by rosekidsmom  on  June 28 2009  at  09:53 AM
  4. I reckon 1 of 2 ways.

    1-build complete lift onto supports like rosekidsmom suggests.

    2- Build it with the middle section pushed together for balance. (like a kind of square) and then carefully slide dominos out till they're in position.

    Also thoughts:
    3- If you look at the pic the supports plus 4 middle dominos should stand on their own as they are counterbalanced (almost) perfectly.

    4- No time to edit please excuse lack of structure.
    Posted by Chris  on  June 29 2009  at  02:10 AM
  5. The posts or supports with four dominoes on top would not stand on their own; for them to be balanced, the end of the top domino would have to line up with the edge of the vertical post, and it clearly extends past in the picture. Also, if they were balanced, the structure would fail, because the centerpiece would cause an imbalance and crash through the middle. Building it upside down would not work, as was suggested, because the stair-like structure would be almost completely unsupported and would quickly fall.

    If, however, you began construction with two supports under each stair-like structure, so that two arches are formed on the bottom, this would be easy to assemble, and the side balances could be removed.
    Posted by Molly  on  July 03 2009  at  07:49 PM
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