Physics Mobile Ruler: Understanding the Basics

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SUMMARY

The discussion focuses on the mechanics of the Physics Mobile Ruler, specifically how the spindles influence its motion. The apparatus moves in the opposite direction of the ruler due to the interaction between translational and rotational motions. Unlike normal rolling motion, where the ruler would move at twice the speed of the center of mass of the wheel, the unique design of the spindles results in a cancellation effect that reduces the distance the ruler travels. This explanation clarifies common misconceptions among users regarding the apparatus's functionality.

PREREQUISITES
  • Understanding of basic physics concepts such as translation and rotation.
  • Familiarity with mechanical systems and their components, particularly spindles.
  • Knowledge of rolling motion dynamics.
  • Ability to interpret motion diagrams and their implications.
NEXT STEPS
  • Research the principles of rolling motion in physics.
  • Study the mechanics of spindles in mechanical systems.
  • Explore the effects of translational and rotational motion on apparatus design.
  • Learn about motion diagrams and their applications in physics.
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the mechanics of mobile measurement devices and their operational principles.

teedoff087
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See http://technology.todaysbigthing.com/2008/12/16" .

Can someone explain this?
 
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teedoff087 said:
See http://technology.todaysbigthing.com/2008/12/16" .

Can someone explain this?

yes, I believe so. I couldn't hear the sound on the video (my computer's problem) so I'm not sure I'm explaining exactly the right thing. But here is a try.

It should be easy to see how the spindels cause the whole apparatus to move in the direction opposite the ruler moves. Then, the ruler moves across the top of the big wheel. If this were normal rolling motion the ruler would move at twice the speed of the center of mass of the big whell this is because rolling is a combination of translation and rotation.

The actual motion of the apparatus is again a combination of translation and rotation, but because of the spindels the translational motion is not in the same direction as the rotational motion of the top point of the wheel thus the effects tend to cancel reducing the distance the ruler travels rather than increasing it as in normal rolling motion.
 
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Thank you. That's very helpful. Some members on another board I frequent were confused so I figured I would find out for them (and of course myself).
 

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