Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Frames: Problem Solving I

Frames: Problem Solving I

Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.

Machines: Problem Solving II

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.

Cable: Problem Solving

Cable: Problem Solving

When dealing with a cable that is fixed to two supports and subjected to uniform loading, it is crucial to determine the maximum tension in the cable. This process can be broken down into several key steps, as outlined below:

Cable Subjected to a Distributed Load

Cable Subjected to a Distributed Load

The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.

Frames: Problem Solving II

Frames: Problem Solving II

Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.

Vectors in Engineering Applications

Vectors in Engineering Applications

A steel beam supported by two identical cables provides a practical example of static equilibrium. The beam has a downward weight of 5000 N, while the two cables support it from opposite sides. Because the arrangement is symmetric, each cable makes the same angle of 60° with the horizontal beam and carries the same tension.In equilibrium, the beam remains completely at rest. This means that the total horizontal and vertical forces must both be zero. Each cable pulls along its own direction, so...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Adult Renal Dysfunction and Risk of Dementia or Cognitive Decline: Brain-Kidney Axis Hypothesis Based on a Systematic Review and Meta-Analysis.

The journal of prevention of Alzheimer's disease·2023

Same author

Periodontal disease severity is associated with micronutrient intake.

Australian dental journal·2018

Same author

Thyroid hormone protects hepatocytes from HBx-induced carcinogenesis by enhancing mitochondrial turnover.

Oncogene·2017

Same author

Thyroid hormone receptor represses miR-17 expression to enhance tumor metastasis in human hepatoma cells.

Oncogene·2013

Same author

Thyroid hormone suppresses cell proliferation through endoglin-mediated promotion of p21 stability.

Oncogene·2013

Same author

Corticosterone mediates stress-related increased intestinal permeability in a region-specific manner.

Neurogastroenterology and motility·2013

Search research articles

Related Experiment Video

Updated: Jul 7, 2026

An Instrumented Pull Test to Characterize Postural Responses

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

Ergonomic study of a vertical rope-pulling task from a scaffolding.

S-P Wu¹, C-P Ho, H-C Chi

¹Department of Industrial Engineering and Management Information, Huafan University1, Shihtin Hsiang, Taipei Hsien, Taiwan, Republic of China. spwu@huafan.hfu.edu.tw

|March 4, 2008

Summary

Manual material handling in vertical rope-pulling tasks (VRPS) is optimized using hemp or nylon ropes without gloves. These conditions significantly increase maximum acceptable rope-pulling weight (MAWR) and reduce perceived exertion.

More Related Videos

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Published on: February 12, 2017

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Related Experiment Videos

Last Updated: Jul 7, 2026

An Instrumented Pull Test to Characterize Postural Responses

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Investigating Motor Skill Learning Processes with a Robotic Manipulandum

Published on: February 12, 2017

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Area of Science:

Ergonomics
Occupational Safety
Biomechanics

Background:

Manual material handling (MMH) is a major cause of workplace injuries.
Vertical rope-pulling tasks (VRPS) present unique ergonomic challenges.
Optimizing VRPS can reduce musculoskeletal disorder risks.

Purpose of the Study:

To assess manual material handling problems in VRPS.
To investigate factors affecting maximum acceptable rope-pulling weight (MAWR).
To evaluate the impact of rope characteristics and gloves on exertion.

Main Methods:

Utilized the psychophysical method with 25 young male Chinese subjects.
Investigated effects of rope material, diameter, object size, and glove use.
Measured MAWR, rating of perceived exertion (RPE), and heart rate.

Main Results:

MAWR significantly increased with hemp rope, coarser diameter, smaller object size, and no gloves.
RPE was significantly influenced by rope material, object size, and glove use.
Heart rate showed no significant changes across conditions.

Conclusions:

Hemp rope and no gloves offer the best VRPS conditions for higher MAWR.
Ergonomic interventions should consider rope properties and glove use.
Arms, fingers, and wrists are the most stressed body parts during VRPS.