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Physics is the fundamental branch of science that seeks to understand the natural laws governing matter, energy, space, and time, forming the foundation upon which all other sciences are built. It explores how the universe behaves, from the tiniest subatomic particles to the largest galaxies, revealing the underlying principles that shape everything around us. The word “physics” originates from the Greek term physis, meaning “nature,” emphasizing its role in describing and explaining natural phenomena. The development of physics has been one of humanity’s greatest intellectual achievements, providing not only deep insights into the workings of the cosmos but also driving technological and scientific progress across centuries. Classical physics emerged through the works of great thinkers like Aristotle, Galileo Galilei, Isaac Newton, and James Clerk Maxwell, who laid the groundwork for mechanics, thermodynamics, electromagnetism, and optics. Newton’s laws of motion and universal gravitation unified celestial and terrestrial mechanics, explaining how objects move and interact under forces, while Maxwell’s equations combined electricity, magnetism, and light into a single elegant framework, forming the basis of electromagnetic theory. These foundational discoveries led to remarkable technological advancements, including electricity generation, motors, telecommunications, and optical instruments. However, by the late 19th century, classical physics began to face limitations when applied to extreme conditions, such as the behavior of atoms, high-speed particles, or intense gravitational fields, leading to revolutionary developments in modern physics through the introduction of quantum mechanics and relativity. Albert Einstein’s theory of special relativity redefined our understanding of space and time, revealing that they are intertwined into a four-dimensional continuum called spacetime, and that the laws of physics remain consistent for all observers regardless of their relative motion. His subsequent general theory of relativity extended these ideas to include gravity, not as a force, but as a curvature of spacetime caused by mass and energy, accurately predicting phenomena such as the bending of light near massive objects and the expansion of the universe. Meanwhile, quantum mechanics, developed by Max Planck, Niels Bohr, Werner Heisenberg, and Erwin Schrödinger, revolutionized the microscopic world by describing the probabilistic nature of particles, wave-particle duality, and quantized energy levels, which classical physics could not explain. These two pillars of modern physics—quantum theory and relativity—form the bedrock of our current understanding of reality, though they remain fundamentally incompatible in certain domains, inspiring ongoing research into a unified “theory of everything.”

Physics branches into several specialized fields, each focusing on different aspects of matter and energy. Classical mechanics studies the motion of obje

1. DEPARTMENT OF CSE(CYBER SECURITY) 1 ST YEAR GROUP PRESENTATION OUR TEAMMATES : 1.RAHUL J 2.RIYAS R 3.ROHITH KUMAR U 4.SANDHIYA Y 5.SANTHOSH KUMAR A 6.SARANYA D ENGINEERING PHYSICS PRESENTED BY : RAHUL J

2. What is Time Travel ? Time travel is the concept of moving between different points in time, similar to how we move through space. It has fascinated humans for centuries, appearing in countless stories, myths, and modern science fiction. Movies like Interstellar, Back to the Future, and Tenet have popularized the idea, sparking both curiosity and scientific debates. While time travel is often imagined as using a “time machine,” real science looks at whether physical laws allow such journeys.

3. Physics about Time travel : Physics, time is treated as the fourth dimension, alongside the three dimensions of space. Together, they form what is called space time a single, unified framework that links space and time. This means that events are not just “where” they happen but also “when.” Understanding this relationship is essential because time behaves differently depending on how objects move or how strong gravity is in a given place.

4. Scientists about Time Travel : Scientists have proposed several theoretical methods that could make time travel possible. One involves time dilation at extremely high speeds: if you travel near the speed of light and return, you will have experienced less time than those who stayed on Earth. Another idea is wormholes, hypothetical tunnels that could connect distant points in spacetime . Cosmic strings, extremely thin but dense structures predicted by some theories, might also bend spacetime in ways that allow time loops.

5. PARADOX A Situation or statement with two or more parts that seem strange or impossible together. Grandfather Paradox Bootstrap Paradox Twin Paradox Butterfly Effect

6. Grandfather Paradox Story: You travel back in time and accidentally prevent your grandfather from meeting your grandmother. Problem: If your grandfather never had children, you would never be born… but if you were never born, how could you go back and stop them?

7. Bootstrap Paradox Story: A person goes back in time with a famous invention (e.g., a book), gives it to someone in the past, and that person later publishes it as their own. Problem: The object or idea has no clear point of origin — it exists in a loop forever.

8. Twin Paradox Story: One twin travels in a fast spaceship near light speed, while the other stays on Earth. Effect: Due to time dilation, the travelling twin ages slower and returns younger than the twin on Earth.

9. Butterfly Effect Story: A small change in the past (e.g., stepping on a butterfly) leads to massive changes in the future. Problem: Even tiny actions in the past could rewrite history completely.

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