Everyday Physics & Laws of Motion
Classical mechanics and wave physics explain fundamental physical phenomena observed in daily life. Sir Isaac Newton formulated the three laws of motion in the 1687 treatise Philosophiæ Naturalis Principia Mathematica, establishing the principles of inertia, force ($F=ma$), and action-reaction pairs. Optical principles such as total internal reflection govern optical fiber communications and mirage formation, while atmospheric scattering (Rayleigh scattering) explains why the daytime sky appears blue and sunsets appear red. Thermodynamics governs heat transfer through conduction, convection, and radiation, adhering to the conservation of energy stated in the First Law. Bernoulli's principle explains aerodynamic lift in aircraft wings and the operation of carburetors.
Key Concepts & Examination Highlights
- Rayleigh scattering causes shorter blue wavelengths of sunlight to scatter more intensely in the upper atmosphere, giving the sky its blue color.
- Total internal reflection occurs when light travels from a denser to a rarer medium at an angle of incidence greater than the critical angle.
- Newton's First Law of Motion, also known as the Law of Inertia, states that an object remains at rest or in uniform motion unless acted on by an external net force.