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Related Concept Videos

Machines01:19

Machines

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
Simplification of a Force and Couple System: II01:23

Simplification of a Force and Couple System: II

In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
Machines: Problem Solving I01:22

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
Unsymmetric Bending01:18

Unsymmetric Bending

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...

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Related Experiment Video

Updated: May 16, 2026

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand
06:44

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand

Published on: May 20, 2020

Bimanual interference associated with handling different tool transformations.

Cristina Massen1, Christine Sattler

  • 1Leibniz Research Centre for Working Environment and Human Factors, Ardeystrasse 67, Dortmund, Germany. massen@ifado.de.

Journal of Experimental Psychology. Human Perception and Performance
|November 15, 2012
PubMed
Summary
This summary is machine-generated.

Using tools with similar spatial transformations for both hands improves bimanual coordination and reduces errors. This finding highlights general constraints in how the brain controls tool-use actions.

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Published on: April 21, 2023

Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Human-Computer Interaction

Background:

  • Bimanual coordination research identifies interference from differing movement parameters or targets.
  • Tool use introduces unique complexities to bimanual motor control.

Purpose of the Study:

  • To investigate the extent and origin of bimanual interference during tool-use actions.
  • To determine how tool properties and target locations influence coordination.

Main Methods:

  • Participants performed bimanual movements with two tools to cued targets.
  • Tools varied in spatial compatibility (compatible vs. incompatible transformations).
  • Target locations were either same or different directions; tool transformations were congruent or incongruent.

Main Results:

  • Shorter reaction times (RTs) and fewer errors occurred when tool transformations were congruent.
  • Faster initiation and fewer errors were observed with same-direction targets, modulated by tool congruency.
  • Effects persisted across different grips and tool types, ruling out early perceptual processing.

Conclusions:

  • Congruent tool transformations significantly enhance bimanual coordination efficiency.
  • Bimanual tool use is subject to general constraints, impacting motor programming and execution.
  • Findings suggest fundamental principles governing the neural control of tool-assisted actions.