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Related Concept Videos

Applications of Stress01:04

Applications of Stress

Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Machines: Problem Solving II01:30

Machines: Problem Solving II

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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...
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...

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Related Experiment Video

Updated: Jun 18, 2026

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance
07:19

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Published on: March 19, 2020

Biomechanical analysis for handle stability during maximum push and pull exertions.

Na Jin Seo1, Thomas J Armstrong

  • 1Department of Industrial Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA. seon@uwm.edu

Ergonomics
|November 27, 2009
PubMed
Summary

Handle stability significantly impacts maximum push and pull force. Stable handles allow users to apply additional vertical forces, increasing overall push/pull strength compared to unstable handles.

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Published on: April 15, 2020

Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Ergonomics

Background:

  • Understanding the biomechanics of human force exertion is crucial for designing effective tools and interfaces.
  • Handle stability is a key factor that may influence the ability to generate maximal push and pull forces.
  • Previous research has not fully elucidated the specific mechanisms by which handle stability affects force production.

Purpose of the Study:

  • To investigate the influence of handle stability on maximal push and pull force generation.
  • To determine if subjects apply additional forces (vertical and lateral) when using a stable versus an unstable handle.
  • To examine the relationship between these additional forces and the resultant push/pull force.

Main Methods:

  • Eight healthy participants performed maximal push and pull exertions in a seated position.
  • Exertions were conducted using both a stable and an unstable handle.
  • Measurements included maximum push/pull force, vertical force, and lateral force.

Main Results:

  • For the unstable handle, vertical and lateral forces were negligible during push and pull exertions.
  • With the stable handle, participants generated significant downward force during pushing and upward force during pulling.
  • These additional vertical forces were significantly associated with increased push and pull forces, respectively, when using the stable handle.

Conclusions:

  • Handle stability is a critical factor in maximizing human push and pull force.
  • The ability to generate stabilizing vertical forces, facilitated by a stable handle, enhances overall force output.
  • These findings have implications for the design of ergonomic tools, equipment, and interfaces requiring forceful manual operations.