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Related Concept Videos

Work Done by Many Forces01:03

Work Done by Many Forces

The total work done on an object acted upon by multiple forces can be computed using two methods that give the same result. In one method, the work done by each force is first calculated. Then, those values are summed algebraically to calculate the total work done by all the forces. In the second method, the net force is first calculated by a vector sum of all the forces. Then, the work done by this force is obtained.
Since forces perpendicular to the displacement do no work, they do not...
Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
Work and Energy for Variable Forces01:10

Work and Energy for Variable Forces

When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
Compensation Mechanisms01:28

Compensation Mechanisms

The human body employs intricate mechanisms to counteract changes in blood pH, preventing conditions like acidosis (pH < 7.35) and alkalosis (pH > 7.45). These compensatory responses aim to restore normal arterial blood pH by engaging respiratory or renal systems, depending on the source of the imbalance.
Respiratory Compensation
This mechanism addresses metabolic-induced pH imbalances by adjusting breathing rates. Respiratory compensation begins within minutes of detecting a pH...
Vector Functions and Motion: Problem Solving01:30

Vector Functions and Motion: Problem Solving

Accurate position tracking is fundamental to the safe and effective operation of unmanned aerial vehicles (UAVs), particularly during precision maneuvers near complex structures. In this scenario, a drone is programmed to perform a high-precision inspection of a vertical structure, starting at position ((x, y, z) = (3, 0, 0)), with an initial velocity oriented in the positive z-direction. The trajectory of the drone is governed by a time-dependent acceleration function a(t), which is predefined...
Conservative Vector Fields01:29

Conservative Vector Fields

A conservative vector field describes a force or field in which the work done between two points depends only on the initial and final positions. For a ball moving in Earth’s gravitational field, gravity performs work determined by the difference in height, regardless of whether the ball moves vertically or follows a curved trajectory.A vector field is conservative if it can be expressed as the gradient of a scalar potential function, f. In two dimensions, this is written...

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Related Experiment Video

Updated: Jun 12, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Force-field compensation in a manual tracking task.

Valentina Squeri1, Lorenzo Masia, Maura Casadio

  • 1Italian Institute of Technology, RBCS Department, Genoa, Italy. valentina.squeri@iit.it

Plos One
|June 23, 2010
PubMed
Summary
This summary is machine-generated.

Human movement control remains effective even with disturbing forces. This study shows that the brain

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Last Updated: Jun 12, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
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Published on: June 19, 2016

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Published on: January 17, 2013

Area of Science:

  • Neuroscience
  • Human motor control
  • Robotics

Background:

  • Visuo-manual tracking is crucial for many tasks.
  • Understanding human motor control under dynamic conditions is essential.
  • Previous research suggests intermittent control in tracking tasks.

Purpose of the Study:

  • Investigate force/movement control in a hybrid task.
  • Examine the impact of a disturbing force field on tracking performance.
  • Analyze the coordination strategies for dual sub-tasks.

Main Methods:

  • Participants performed a continuous manual tracking task (master sub-task).
  • A disturbing curl viscous force field was introduced (slave sub-task).
  • Tracking error and trajectory deviations were measured.

Main Results:

  • Visuo-manual tracking utilizes an intermittent control mechanism.
  • Force/movement control patterns were not significantly altered by the force field.
  • Interaction forces were managed by a combination of arm stiffness and direct force control.

Conclusions:

  • Human motor control adapts to dynamic environments without altering fundamental patterns.
  • Coordination of dual tasks is rapidly learned.
  • Motor control relies on a combination of stiffness and force strategies, with force dominance.