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Related Concept Videos

Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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Rigid Body Equilibrium Problems - II01:21

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
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Kinetic Energy for a Rigid Body01:13

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Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
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Equation of Motion for a Rigid Body01:12

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The movement of a rigid object can be understood through the equations that explain both translational and rotational motion about the center of mass of the object, point G. This center of mass is the point where the equation of motion for translational motion comes into play, as per Newton's Second Law.
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Virtual Work for a System of Connected Rigid Bodies01:06

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Angular Momentum: Rigid Body01:11

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The total angular momentum of a rigid body can be calculated using the summation of the angular momentum of all the tiny particles rotating in the same plane. Considering all the tiny particles rotating in the x-y plane, the direction of angular momentum of all such particles and that of the rigid body would be perpendicular to the plane of the rotation along the z-axis.
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Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
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Magnetically Driven Undulatory Microswimmers Integrating Multiple Rigid Segments.

Pan Liao1,2, Liuxi Xing1, Shiwu Zhang2

  • 1Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, 999077, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetically driven microswimmer that uses rigid segments to mimic biological undulatory propulsion. This design simplifies fabrication and offers potential for biomedical applications like precision medicine.

Keywords:
3D laser lithographybioinspired robotsmagnetically drivenmicroswimmersmultiple segments

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Area of Science:

  • Robotics and Biomimetics
  • Micro-robotics
  • Locomotion Strategies

Background:

  • Bioinspired microrobots leverage biological locomotion for design.
  • Flexible microrobots offer efficiency but face fabrication challenges with soft materials.
  • Current methods struggle with complex fabrication and component integration.

Purpose of the Study:

  • To propose a bioinspired magnetically driven microswimmer.
  • To mimic undulatory propulsion using rigid segments.
  • To simplify microrobot fabrication and enhance structural integrity.

Main Methods:

  • Designed a microswimmer with four rigid segments connected by joints.
  • Fabricated the microswimmer integrally using 3D laser lithography.
  • Conducted experiments to demonstrate undulatory locomotion in the low Reynolds number (Re) regime.

Main Results:

  • The microswimmer successfully achieved forward propulsion via undulatory locomotion.
  • 3D structures with multiple rigid segments can emulate microswimmer flexibility.
  • The fabrication process was simplified without assembly, enhancing structural integrity.

Conclusions:

  • This work broadens possibilities in microrobot design by emulating flexibility with rigid segments.
  • The magnetically driven microswimmer shows potential for biomedical applications.
  • Future applications include medical diagnosis and precision medicine treatments.