The fun side of mechanics day three countersteering
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The Fun Side of Mechanics: Day Three! Countersteering PowerPoint PPT Presentation


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The Fun Side of Mechanics: Day Three! Countersteering. By Jonathan Abbott. Quick Review. Newton’s First Law Net Force Newton’s Second Law Friction Kinetic vs. Static Newton’s Third Law Center of Mass. Today: Countersteering.

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The Fun Side of Mechanics: Day Three! Countersteering

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The fun side of mechanics day three countersteering

The Fun Side of Mechanics:Day Three! Countersteering

By Jonathan Abbott


Quick review

Quick Review

  • Newton’s First Law

  • Net Force

  • Newton’s Second Law

  • Friction Kinetic vs. Static

  • Newton’s Third Law

  • Center of Mass


Today countersteering

Today: Countersteering

  • Countersteering is when you shift your point of contact (with the ground) in the opposite direction to help you move.

  • So in order to balance, you change where you touch the ground.

Too much this way, ahhh!

Too much that way, ahhh!

Points of Contact


Simon says

Simon Says

We are going to practice how we balance.


Two ways to balance

Two ways to balance

Countersteering

Continuum

Twist body

Change Point of Contact

Change Shape of

Body

What we are talking about today

What we will discuss later


First safety

First Safety!

  • The contact force between you and the ground can hurt!

  • Helmet

    • Wear it, love it, and it will love you back!


Idling on a unicycle overcompensating

Idling on a Unicycle: Overcompensating

Move the

point of contact more than the center of mass


What is the physics of idling

What is the physics of Idling?

Think about the net force


What about the pogo

What about the Pogo?

  • When up in the air, twist your body so that the point of contact underneath you changes, allowing you to remain upright.

  • Overcompensate!


You can pogo on a unicycle aka bunny hops

You can Pogo on a Unicycle!Aka Bunny Hops


A rolla bolla

A Rolla Bolla

  • It’s simple a board on top of a rod thing; like a plane on a cylinder. Let’s draw a force diagram (see next slide)


The fun side of mechanics day three countersteering

  • What forces are between the board and cylinder?

  • What forces are between the ground and the cylinder?

Let’s identify the forces in a force diagram.


The fun side of mechanics day three countersteering

Let’s identify the forces between the person and the board in a force diagram.


Rolla bolla analysis

Rolla Bolla Analysis

  • So how does one balance?

  • By changing the angle of the board on the plane, there becomes frictional forces between the board and cylinder and the cylinder and the ground that together push the person to the left or right.

  • To balance, one has to overcompensate to stay upright.


Parents how smart are they

Parents – How smart are they?

  • When you were first learning to ride a bicycle, what advice did your parents give you?

  • Okay, so using what we have talked about today, how might I be able to make a left turn on a unicycle?


The trick is countersteering

The trick is countersteering

  • I have to turn to the right to make a left turn!

  • This way I can lean.

Normal

Turn right to lean

Turn left


Sharp turning on a unicycle

Sharp turning on a unicycle

  • This makes it a little easier to see.

  • I have to turn right to go left.


Beware

Beware!

  • For a motorcyclist or bicyclist to turn left, they will have to first swerve to the right in what is known as countersteering.

  • They will need extra space!

http://www.flickr.com/photos/jduty/5016023830/sizes/m/in/photostream/


B ikes and scooters

Bikes and Scooters!

  • You do this on a bike, but it can be hard to see.

  • If you ride slowly, you may notice it more.


A little harder to unicycle

A little harder to Unicycle

  • Unicycles can also fall forward or backward.

  • So, if leaning too far forward, speed up temporarily to get the unicycle in front and then slow down..

  • If leaning too far backward, slow down until upright, and then continue forward.

  • It’s like “idling” while moving forward.


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