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The Scope of Physics01:17

The Scope of Physics

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Physics is concerned with the interactions of energy, matter, space, and time, in order to discover the underlying mechanisms that underpin all phenomena. The word "physics" comes from the Greek word "phúsis", which means nature. Physics seeks to comprehend the natural world around us at its most fundamental level. It emphasizes the use of quantitative laws to do this, which could be valuable in other fields that want to push the performance boundaries of present...
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Models, Theories, and Laws01:16

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Scientists frequently use models to help them comprehend a specific collection of phenomena. In physics, a model is a condensed version of a physical system that is too complex to study thoroughly. One such example is the light wave model; unlike water waves, light waves are typically invisible to us. Nonetheless, it is helpful to think of light as being composed of waves, since investigations show that light behaves like water waves. Since it is impossible to visually see what is genuinely...
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Induction01:16

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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
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Physical Pendulum01:06

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When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
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Equation of State01:07

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The equation of state is an equation that relates physical quantities, such as pressure, volume, temperature, and the number of moles, of a thermodynamics system with each other. The equation relating physical quantities with each other can be a simple mathematical expression or too complicated to express in mathematical form. In either case, a relationship between physical quantities exists. If the equation of state cannot be expressed in a mathematical form, then experimental data and...
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Conservation of Mechanical Energy01:05

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The mechanical energy E of a system is the sum of its potential energy U and the kinetic energy K of the objects within it. What happens to this mechanical energy when only conservative forces cause energy transfers within the system—that is, when frictional and drag forces do not act on the objects in the system? Also assume that the system is isolated from its environment; in other words no external force from an object outside the system causes energy changes inside the system.
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Related Experiment Video

Updated: Apr 21, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Some physics from 550 BC to AD 1948.

Jeremy C Ganz

    Progress in Brain Research
    |November 8, 2014
    PubMed
    Summary

    This chapter explores the history of physics and technology, tracing the development of particle accelerators and their role in understanding atomic structure and radioactivity for applications like radiosurgery.

    Area of Science:

    • Physics
    • History of Science
    • Medical Technology

    Background:

    • Traces the historical development of physics concepts from ancient Greece to early 20th-century nuclear physics.
    • Highlights the technological advancements necessary for scientific discovery, particularly in atomic structure and radioactivity.

    Observation:

    • Early experiments relied on vacuum tubes and naturally occurring radioactive materials.
    • A need arose for controllable, high-energy subatomic particles to probe atomic interiors.

    Findings:

    • The invention of particle accelerators marked a new era in atomic and nuclear physics research.
    • These machines enabled the generation of usable subatomic particles for detailed study.

    Implications:

    Keywords:
    acceleratorsphysics historyunitsvacuum tube experiments

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    • Laid the groundwork for understanding atomic structure and radioactivity.
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