A weight lifter raises a 180 -kg barbell to a height of 1.95 m. How much work is done by the wei

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A weight lifter raises a 180 -kg barbell to a height of 1.95...

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Key Concepts

Work

Work in physics is defined as the product of the component of force along an object's displacement and the magnitude of that displacement. It quantifies the transfer of energy when a force moves an object. In this context, work is calculated using the formula: work = force × displacement, with appropriate consideration of the direction of the force relative to the displacement.

Gravitational Potential Energy

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. When an object is raised to a height, work is done against the gravitational force, thereby increasing its gravitational potential energy. The increase in gravitational potential energy corresponds exactly to the amount of work done if the process is done slowly, neglecting any losses.

Force due to Gravity

The force due to gravity acting on an object is determined by the object's mass and the acceleration caused by gravity. This force, often represented as weight, is calculated using the equation: weight = mass × gravitational acceleration. Understanding this concept is crucial when calculating the work done against gravity, since the force that must be overcome is the object's weight.

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