Introduction To Physics
Introduction

Science consists of the theories and laws that are the general truths of nature as well as the body of knowledge they encompass. Scientists are continually trying to expand this body of knowledge and to perfect the expression of the laws that describe it. Physics is concerned with describing the interactions of energy, matter, space, and time, and it is especially interested in what fundamental mechanisms underlie every phenomenon. The concern for describing the basic phenomena in nature essentially defines the realm of physics.


Physics is the branch of science which deals with matter and its relation to energy. It involves the study of physical and natural phenomena around us. Examples of these phenomena are formation of rainbow, occurrence eclipse, the cause of sunset and sunrise, formation of shadow and many more.

Branches of physics

There are six broad branches of physics. These are:

  1. Mechanics
  2. This branch deals majorly with motions under the influence of forces. Under this branch, we look into details the aspects of linear, circular and oscillatory motions as well as motion of fluids
  3. Geometrical Optics
  4. This branch takes a keen look at the behavior of light in various media and lenses.
  5. Electricity and magnetism
  6. This branch looks at the interaction between electric fields and magnetic fields and the applications of such interactions.
  7. Thermodynamics
  8. This branch looks at how heat as a form of energy is transformed to/from other forms of energy.
  9. Atomic Physics
  10. This area of study is targeted at the behavior of particles of the nucleus and the accompanying energy changes.
  11. Waves
  12. It deals with the study of the propagation of energy through space.
Applications of physics

The knowledge of physics of physics is essential in the following fields

The physics Laboratory

Discoveries made in science are done so through the process of experimentation. Knowledge that furthers the science of physics is gained through following the scientific method, which includes performing experiments to prove a hypothesis. Most often these experiments are performed in a physics laboratory, more commonly called a physics lab. Physics labs are also used by students who learn about the science through demonstration in a physics lab.

Physics Apparatus and their Uses
Apparatus Use
Bunsen Burner Used for heating substances in the laboratory.
Thermometer Measures temperature of a substance or environment.
Microscope Used to magnify small objects for detailed examination.
Balance Scale Measures the mass of an object.
Spring Scale Measures the force applied to an object.
Ruler or Meter Stick Measures length or distance.
Voltmeter Measures electrical potential difference (voltage).
Ammeter Measures electric current flowing through a circuit.
Barometer Measures atmospheric pressure.
Galvanometer Detects and measures small electric currents.
Spectrometer Measures the wavelengths of light and properties of spectra.
Concave Mirror Forms real or virtual images depending on the object's position.
Convex Lens Converges light to form real or virtual images.
Prism Separates white light into its constituent colors (dispersion).
Electroscope Detects the presence of electric charges.
Geiger-Muller Counter Measures radioactivity in a sample.
Oscilloscope Displays and analyzes electronic signals.
Electromagnet Creates a magnetic field when an electric current passes through it.
Ripple Tank Demonstrates the behavior of water waves.
Calorimeter Measures the heat transfer in chemical reactions or physical processes.
Diode Allows current to flow in one direction only in a circuit.
Capacitor Stores electrical energy and releases it when needed.
Rheostat Controls the amount of current in a circuit by varying resistance.
Resistor Restricts the flow of current in a circuit, regulating the voltage.
Retort Stand Used to hold and support laboratory apparatus like clamps and burettes.
Split Cork Used to hold small items like pins or needles securely.
Wires Conducts electricity between various components in a circuit.
Stopwatch Measures the time duration of an event with high accuracy.
Plasticine Used in experiments to hold or mold various components.
Jockey Used to make contact with electrical circuits for measurements.
Metre Bridge Measures the unknown resistance by balancing a known resistance.
Resistance Box Contains variable resistors to calibrate and measure electrical resistance.
EMF Source Provides a known electromotive force in electrical experiments.
Pins Used to hold objects on boards or surfaces during experiments.
G Clamp Used to hold objects firmly in place during experiments.
Metre Rule Measures length or distance with high precision.
General Laboratory Precautions
Assessment Quiz
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