Thursday, October 28, 2021

PHYSICAL WORLD .LESSON -1

     Question and Answers from 1st Chapter of Plus one Physics

Physics is a study of basic laws of nature and their manifestation in different natural phenomena. Physics is the study of physical world and matter and its motion through space and time, along with related concepts such as energy and force.

  • Word Physics is derived from the Greek word phusikḗ meaning nature.
  • Two principal types of approaches in Physics are:
    • Unification: This approach considers all of the world’s phenomena as a collection of universal laws in different domains and conditions. Example, law of gravitation applies both to a falling apple from a tree as well as motion of planets around the sun. Electromagnetism laws govern all electric and magnetic phenomena.
    • Reduction: This approach is to derive properties of complex systems from the properties and interaction of its constituent parts. Example, temperature studied under thermodynamics is also related to average kinetic energy of molecules in a system {kinetic theory}.

Impactand uses of Physics

  • It can explain a phenomena happening over a large magnitude with a simple theory.
  • Experiments and observations are used to develop new theories for unidentified phenomena and improve old theories for existing phenomena.
  • Development of devices using laws of physics.
  • Scope of Physics

    Scope of Physics is vast as it covers quantities with length magnitude as high as 1040m or more (astronomical studies of universe) and as low as 10-14m or less (study of electrons, protons etc). Similarly the range of time scale goes from 10-22s to 1018s and mass from 10-30kg to 1055kg.

    Physics is broadly divided into two types based on its scope - Classical Physicsand Modern Physics. Classical physics deal with the macroscopic phenomena while the modern physics deals with the microscopic phenomena.

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