Key Stage 3 (KS3) Physics Practice Exam – Prep, Questions & Study Guide

The principle of conservation of energy states that energy can be transformed from one form to another, but it cannot be created or destroyed. This means that in any closed system, the total amount of energy remains constant over time. For example, when you rub your hands together, mechanical energy from your motion is converted into thermal energy, which warms your hands. No energy has disappeared; it has simply changed form.

This principle is fundamental in physics and applies to numerous phenomena in both everyday life and scientific contexts. Understanding this concept allows us to analyze systems, predict behavior, and understand that energy will always balance out, regardless of the transformations it undergoes.

In contrast, the other statements present incorrect interpretations of energy. Some may suggest that energy can be created or destroyed, which contradicts this fundamental principle. Others might imply that energy is constant in all processes without acknowledging that transformations can occur, leading to changes in how energy is manifested. Thus, stating that energy can only be created is entirely inconsistent with our understanding of the physical laws governing energy.