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January, 2024 Puzzler

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    January, 2024 Puzzler

    How far do you lean?

    Two motorcycles are going through a constant radius curve such that each enters and exits at the same time.

    One hugs the inside and the other the outside.

    Does one have to lean more than the other?


    #2
    Total guess because I suck at physics but I'll say their lean angle is the same. The outside bike has farther to travel so must go faster to exit at the same time but is also traveling along a wider arc.

    Comment


    • 955i
      955i commented
      Editing a comment
      Pitts, I like your thinkin,' but I'm going to say the outside bike has to lean more. If I exagerate the turn and make it a really wide road (like 200' wide) and a pretty sharp turn, I imagine the bike on the outside really having to crank it over to make up all the lost distance

    #3
    Hint....

    Click image for larger version  Name:	Screenshot 2024-02-01 5.53.15 PM.png Views:	1 Size:	70.0 KB ID:	54162

    Click image for larger version

Name:	Screenshot 2024-02-02 11.18.53 AM.png
Views:	1
Size:	57.9 KB
ID:	54163
    Last edited by wildbears; 02-02-2024, 11:20 AM.

    Comment


      #4
      Originally posted by wildbears View Post
      How far do you lean?

      Two motorcycles are going through a constant radius curve such that each enters and exits at the same time.

      One hugs the inside and the other the outside.

      Does one have to lean more than the other?

      It's physics. Radius, cg and speed determine lean angle. Bike or bicycle, lean angle would be the same for the given radius as long as the CG and radius is the same. Leaning off changes things. Mass is cancelled out of the equation. Bigger radius, less lean. More speed, more lean.
      Last edited by cabnfvr; 02-04-2024, 07:19 AM. Reason: left out the word radius, which is important. :)

      Comment


        #5
        Inside leans further. Less distance tighter radius. But not by much. Your hint was just all greek to me.

        Comment


          #6
          Originally posted by wildbears View Post
          Hint....

          Click image for larger version Name:	Screenshot 2024-02-01 5.53.15 PM.png Views:	1 Size:	70.0 KB ID:	54162

          Click image for larger version

Name:	Screenshot 2024-02-02 11.18.53 AM.png
Views:	1
Size:	57.9 KB
ID:	54163

          So it's a function of the square of velocity which would indicate that the outside turning motorcycle would lean farther/going faster. Not intuitive and I'm not smart enough to challenge the equation.

          Comment


            #7
            Y'all worry about some crazy shit. I don't want my tangent being 0.

            Comment


              #8
              See my response to Comment 1.

              Comment


              • Lee
                Lee commented
                Editing a comment
                To keep it simple I was thinking the same as you.
                If I had to figure out all the math, I'd run off the road

              #9
              The bike on the outside has to travel further in the same amount of time as the inside bike. So the outside bike has to travel at a higher average speed than the inside bike. Whether one has to lean more than the other depends entirely on which one uses Royal Purple.

              Comment


                #10
                Lee, "Keep it simple, Stupid" is a motto lawyers live by!

                Comment

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