Linear Expansivity Made Easy | Physics Question Solved Step by Step (Pidgin English Tutorial)

Описание: In this video, I break down the concept of Linear Expansivity in Physics using a practical example that every Physics student can easily follow and understand. The explanation is delivered in Pidgin English, making it fun, relatable, and simple for learners, especially those who often struggle with Physics because of the heavy technical language used in textbooks and classrooms.

The question we are solving is:

A brass rod is 2.0 meters long at a certain temperature. What is its length for a temperature of 100 Kelvin, given that the linear expansivity of brass is 18.0 × 10⁻⁶ per Kelvin?

This is a classic type of Physics problem that shows up in high school exams, WAEC, NECO, JAMB, and even in university-level introductory Physics. By working through it step by step, you will not only get the correct answer but also understand the logic and formula behind it.

🔍 What You’ll Learn in This Video:

The Meaning of Linear Expansivity – I explain what linear expansivity means, why it is important in Physics, and how it applies to real-life materials such as brass rods, bridges, railway lines, and everyday metallic objects that expand when heated.

The Formula for Linear Expansion – You’ll see how to use the formula:

ΔL=L×α×ΔT

where:

ΔL is the change in length,

L is the original length of the rod,

α (alpha) is the linear expansivity of the material,

ΔT is the change in temperature.

Step-by-Step Calculation – I carefully substitute the values given in the question (L = 2.0 m, α = 18.0 × 10⁻⁶ K⁻¹, ΔT = 100 K) and show how to calculate the change in length. Then I add the result to the original length to find the new length of the brass rod.

How to Avoid Common Mistakes – Many students forget to add the change in length to the original length, or they misplace decimal points when dealing with very small numbers like 10⁻⁶. In this tutorial, I highlight these common errors and show you how to avoid them.

Practical Applications – Beyond the calculations, I give real-world examples of how expansion works in everyday life: why bridges have expansion joints, why railway tracks are not laid too tightly, and why metallic objects behave differently in hot versus cold environments.

Pidgin English Explanation – Many Physics tutorials are in formal English, which can sometimes make students feel lost. By teaching in Pidgin English, I break the barrier and make Physics accessible to everyone, especially students in Nigeria and across Africa who understand Pidgin better than textbook English.

Simple and Relatable – No jargon, no complicated terms. Just step-by-step, easy-to-follow reasoning.

Exam-Oriented – This is the exact type of problem you’ll face in Physics exams. Watching this video will prepare you to tackle similar questions confidently.

💡 Who Should Watch This Video?

SS1 – SS3 Students preparing for WAEC, NECO, or JAMB.

University Freshers taking introductory Physics courses.

Parents and Guardians who want to help their kids with Physics homework.

Anyone curious about Science and how materials behave under heat.

By the end of this video, you will clearly understand how linear expansion works, how to use the formula correctly, and how to apply it to solve Physics problems. If you find this tutorial helpful, don’t forget to like, share, and subscribe so you never miss any of my future lessons.

Let’s make Physics easy, fun, and enjoyable together!

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