Newton’s Laws of Motion Understanding the core laws is the foundation for solving mechanics problems. Momentum & Impulse These concepts are highly tested in collision and impact questions. Quantity Formula NEET Explanation & Key Insights Linear Momentum (\(\displaystyle \vec{p}\)) \(\displaystyle \vec{p} = m\vec{v}\) The quantity of motion contained in a body. Conservation of Momentum If … Read more
Basic Kinematic Quantities Quantity Formula Key Point Displacement \(\displaystyle\Delta x=x_f-x_i\) Shortest directed distance Average Velocity \(\displaystyle\frac{\text{Displacement}}{\text{Time}}\) Depends on displacement Average Speed \(\displaystyle\frac{\text{Total Distance}}{\text{Total Time}}\) Depends on actual path Instantaneous Velocity \(\displaystyle v=\frac{dx}{dt}\) Velocity at an instant Acceleration \(\displaystyle a=\frac{dv}{dt}\) Rate of change of velocity Variable acceleration \(\displaystyle a=v\frac{dv}{dx}\) Useful when acceleration depends on distance 2. … Read more
1. The Core of Measurement Every physical quantity (Q) is measured as a product of its numerical value (n) and its standard unit (u). 2. Base Quantities & Their Dimensions To understand how derived quantities are built from fundamental ones, we use dimensions. Dimensional Formula & Equation Classification of Physical Quantities Based on dimensional analysis, … Read more
Temperature is something we all feel intuitively—hot or cold—but measuring it precisely requires a scientific approach. We’ll break this down step by step in a simple, logical order, starting with the history and building up to how we assign numerical values to temperature. I’ll use clear headings, bullet points, and equations to make it easy … Read more
Long ago, in the early 1600s, a curious scientist named Galileo Galilei made an unusual observation inside a large cathedral in Italy. As he sat watching a chandelier swinging gently from the ceiling, he noticed something fascinating — the time it took for the chandelier to swing back and forth remained nearly the same, even … Read more
The story of springs and their potential energy is a fascinating one that stretches back centuries. Before we had the coiled springs we’re familiar with today, people used leaf springs made of curved metal strips. These were not very efficient and required constant lubrication, plus they were noisy. The game-changer came in 1763 when R. … Read more
The journey into the history of nuclear fusion starts in the early 20th century. Scientists were curious about how stars, including our Sun, produced such vast amounts of energy. The British physicist Arthur Eddington was one of the first to suggest that stars might be powered by nuclear fusion, combining hydrogen atoms to form helium … Read more
The discovery of nuclear fission marked a significant milestone in atomic physics. It all began on December 19, 1938, in Berlin, when German chemists Otto Hahn and Fritz Strassmann were conducting experiments bombarding uranium with neutrons. To their surprise, they found that instead of creating a heavier element as expected, the uranium nucleus split into … Read more
The discovery of beta decay traces back to the late 19th century. In 1899, Ernest Rutherford, a pioneering physicist in radioactivity, observed that some elements emitted radiation that could penetrate metal foils and fog photographic plates. This was different from alpha radiation, which he had already characterized. Rutherford named this new radiation “beta rays,” after … Read more
Alpha decay was first discovered by Ernest Rutherford in the early 20th century. While studying radioactivity, he found that certain elements emitted a type of radiation that could be blocked by just a sheet of paper or even the skin. This was unlike other forms of radiation, such as beta or gamma rays, which required … Read more