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Related Concept Videos

Work Done by Many Forces01:03

Work Done by Many Forces

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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...
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Work Done on a System by External Force01:11

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The work done by an external force on a particle changes its kinetic energy. However, internal forces must also be considered for a system of interacting particles. The potential energy formulation helps formulate the effect of internal forces. The net work done by an external force can be written in terms of the total change of mechanical energy, which includes both kinetic and potential energies.
In the presence of a non-conservative opposing force, like friction, some part of the work done...
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Work Done by Gravity01:04

Work Done by Gravity

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Gravitation is one of the four fundamental forces in nature. The force between objects on Earth and Earth itself is called gravity.
Like other forces, gravity does work on an object if it displaces it toward the Earth's center. In this case, the work done by gravity is said to be positive. If an external force acts on the object against the pull of gravity and manages to lift it away from the Earth's center, work is done against gravity. In this case, the net work done is said to be...
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Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
310
Work Done Over an Inclined Plane01:11

Work Done Over an Inclined Plane

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The center-of-mass framework helps to easily describe the work done on rigid bodies. Since the internal forces in a rigid body do no work, they can be ignored, and the external forces can be considered in the work-energy theorem.
The work done by gravity to move a rigid body, or the work done by an opposing force to move a rigid body against gravity, can be calculated using the center-of-mass framework. It is the line integral of the force of gravity over the path, considered positive if...
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Work Done During Volume Change01:17

Work Done During Volume Change

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In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
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Related Experiment Video

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Acquisition of a High-precision Skilled Forelimb Reaching Task in Rats
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A hard-won success - but the work continues.

Mark Little

    The Veterinary Record
    |February 3, 2023
    PubMed
    Summary

    Senior veterinary leaders worked for two years to maintain access to animal medicines in Northern Ireland. This effort secured essential veterinary medicines for animal health and welfare in the region.

    Area of Science:

    • Veterinary Medicine
    • Animal Health Policy

    Background:

    • Access to veterinary medicines in Northern Ireland faced significant challenges.
    • The Northern Ireland (NI) Branch of the British Veterinary Association (BVA) initiated a two-year project to address these issues.

    Purpose of the Study:

    • To document and reflect on the efforts undertaken to preserve access to veterinary medicines in Northern Ireland.
    • To highlight the importance of sustained access to medicines for animal health and welfare.

    Main Methods:

    • A retrospective review of two years of advocacy and policy work by the BVA NI Branch.
    • Analysis of the challenges and successes in maintaining medicine supply chains.

    Main Results:

    • Sustained access to essential veterinary medicines was secured for Northern Ireland.

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  • The BVA NI Branch played a crucial role in advocating for continued access.

    • Conclusions:

    • The successful preservation of veterinary medicine access demonstrates the impact of dedicated advocacy.
    • Continued vigilance and policy engagement are necessary to ensure ongoing animal health and welfare in the region.