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Related Concept Videos

Work and Power for Rotational Motion01:27

Work and Power for Rotational Motion

Work and power in rotational motion are completely analogous to work and power in translational motion. The total work done to rotate a rigid body through an angle 'θ' about a fixed axis is the sum of the torques integrated over the angular displacement. Hence, torque and angular displacement in rotational motion are analogous to force and linear displacement in translational motion, respectively.
Similarly, the power delivered to a system that is rotating about a fixed axis is given by the...
Work-Energy Theorem for Rotational Motion01:11

Work-Energy Theorem for Rotational Motion

The work-energy theorem for rotational motion is analogous to the work-energy theorem in translational motion. It states that the net work done by an external force to rotate a rigid body equals the change in the object's rotational kinetic energy. The power delivered is simply the time derivative of the work done; therefore, power is the dot product of torque and angular velocity. This relation is analogous to power in translational motion, which is given by the dot product of force and...
Torque01:10

Torque

Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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...
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
The Swing Equation01:21

The Swing Equation

The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque (Τe)...

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Related Experiment Video

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Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
08:55

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Published on: February 5, 2020

A reliable method for assessing rotational power.

Matthew J Andre1, Andrew C Fry, Melissa A Heyrman

  • 1Department of Health, Sport, and Exercise Sciences, University of Kansas, Lawrence, Kansas, USA. matthew.andre@ku.edu

Journal of Strength and Conditioning Research
|February 3, 2012
PubMed
Summary
This summary is machine-generated.

A pulley system combined with a dynamometer reliably measures rotational power in athletes. This research tool provides consistent results for assessing the effectiveness of rotational training programs.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Rotational core training is crucial for power athletes.
  • Reliable methods for assessing rotational power are currently lacking.
  • This study addresses the need for a validated assessment tool.

Purpose of the Study:

  • To determine the test-retest reliability of a pulley system for assessing rotational power.
  • To evaluate kinetic and kinematic measures during a rotational exercise.
  • To establish a reliable tool for measuring rotational power in athletes.

Main Methods:

  • Healthy college-aged participants (n=23) performed seated rotational exercises using a pulley system.
  • Three loads (9%, 12%, 15% body weight) were tested across three sessions.
  • Peak power was analyzed using kinetic and kinematic data, with high reliability (ICC > 0.94).

Main Results:

  • The pulley system demonstrated high test-retest reliability for rotational power assessment across all tested loads.
  • Intraclass correlation coefficients (ICCs) ranged from 0.94 to 0.97.
  • No significant sex-based differences were observed in rotational power measurements.

Conclusions:

  • A pulley system coupled with an external dynamometer is a reliable research tool for assessing rotational power.
  • This method can be utilized to evaluate the efficacy of rotational training interventions.
  • Findings support the use of this system for objective measurement in sports science research.