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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Kinematic Equations - III01:18

Kinematic Equations - III

The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
Lagrange Multipliers: One Constraint01:29

Lagrange Multipliers: One Constraint

In constrained optimization, the objective is to maximize or minimize a quantity while satisfying a fixed condition. A standard example is a rectangular pen built against a barn wall using 100 meters of fencing. Because the wall provides one side of the enclosure, only the other three sides require fencing. The problem is to find the dimensions that produce the greatest possible area.Let L represent the length parallel to the wall and W the width perpendicular to it. The area of the pen is A =...
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
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Related Experiment Video

Updated: Jul 18, 2026

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
15:00

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors

Published on: May 2, 2021

Kinematic analysis of multiple constraints on a pointing task.

Shelby G Thompson1, Daniel S McConnell, Jeremy S Slocum

  • 1Department of Psychology, Wichita State University, 1845 Fairmount, Wichita, KS 67260-0034, United States. sgthompson@wichita.edu

Human Movement Science
|November 28, 2006
PubMed
Summary

The speed/accuracy tradeoff involves effector and task constraints. Target size and movement distance impact movement kinematics, revealing biomechanical and information processing roles in motor control.

Related Experiment Videos

Last Updated: Jul 18, 2026

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
15:00

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors

Published on: May 2, 2021

Area of Science:

  • Human-computer interaction
  • Motor control
  • Cognitive psychology

Background:

  • The speed/accuracy tradeoff is a fundamental concept in motor control research.
  • Understanding the underlying constraints is crucial for optimizing human-computer interaction and task performance.

Purpose of the Study:

  • To investigate the distinct roles of effector and task constraints on the speed/accuracy tradeoff during pointing movements.
  • To analyze the kinematic effects of movement distance, target size, movement orientation, and C-D gain.

Main Methods:

  • Examined kinematics of discrete pointing movements using a computer mouse.
  • Manipulated movement distance, target size, movement orientation, and C-D gain.
  • Analyzed velocity profiles and sub-movement phases.

Main Results:

  • Target size altered velocity profile shape by extending corrective sub-movements.
  • Movement distance scaled velocity profiles without changing shape.
  • Movement orientation and C-D gain influenced both scaling and shape of velocity profiles.
  • Target size identified as a task constraint; movement distance as an effector constraint.

Conclusions:

  • Movement orientation exhibits characteristics of both task and effector constraints.
  • C-D gain interacts with task and effector constraints but is not a constraint itself.
  • Biomechanical and information processing factors significantly contribute to the speed/accuracy tradeoff.