Physics is often imagined as a discipline filled with complex equations written across whiteboards or experiments conducted in high-tech laboratories. In reality, physics underpins nearly every aspect of our daily life—from the sound of an alarm clock that wakes us up to the final scroll on a smartphone before sleep. These ordinary experiences are governed by the same physical laws that explain the motion of planets and stars throughout the universe [1]. Consider something as simple as making a cup of coffee. When hot water is poured into a cup, thermal energy flows from the hotter water to the cooler cup and surrounding air, in accordance with the laws of thermodynamics [2]. At the same time, the aroma rising from the coffee is caused by faster-moving molecules escaping into the air as temperature increases. This behavior is explained by kinetic theory, where temperature is directly related to the average energy of particles [3]. As the coffee cools, heat is transferred through conduction, convection, and radiation.

Walking, an activity we rarely think about, provides a clear example which applies the concept of classical mechanics in our daily lives. Each step follows Newton’s laws of motion: the foot pushes backward on the ground, and the ground exerts an equal and opposite force that propels the body forward [1]. Friction is essential in this process—without it, forward motion would not be possible and slipping would occur instead. Balance, momentum, and gravitational force work together to allow smooth and controlled movement.

Modern technology showcases even more striking applications of physics. Smartphones rely on semiconductor physics to control electrical currents at microscopic scales [4]. Touchscreens operate by detecting changes in electric fields when a finger makes contact, while digital cameras use principles of optics and quantum physics to convert light into electrical signals [5]. Wireless communication, meanwhile, is based on electromagnetic waves that carry information through space without the need for physical connections. Natural phenomena also obey the same fundamental laws of physics. Rainbows form due to the refraction, internal reflection, and dispersion of sunlight within water droplets [3]. Thunder is produced by the rapid expansion of air heated intensely by lightning, generating powerful sound waves [2]. These phenomena demonstrate that the laws of physics are universal, governing events both in the sky and in our everyday surroundings.

In conclusion, physics is not merely an academic subject confined to classrooms and textbooks. It is a lens through which we can better understand daily experiences and the natural world. By recognizing the physics behind ordinary activities, we gain a deeper appreciation of the coherence, and beauty of this remakable universe.

References

1. Halliday, D., Resnick, R., & Walker, J. Fundamentals of Physics. Wiley.
2. Serway, R. A., & Jewett, J. W. Physics for Scientists and Engineers. Cengage Learning.
3. Hewitt, P. G. Conceptual Physics. Pearson Education.
4. Tipler, P. A., & Mosca, G. Physics for Scientists and Engineers. W.H. Freeman.
5. Feynman, R. P. The Feynman Lectures on Physics. Addison-Wesley.

Author: Dr. Emma Ziezie Mohd Tarmizi

             Physics Unit, ASPutra

Date of Input: 02/01/2026 | Updated: 02/01/2026 | emma