In this deck, we'll explore the fundamental laws that govern motion, as described by Sir Isaac Newton. You'll learn about inertia, how forces cause acceleration, and the famous 'equal and opposite' reaction law. We will then use these ideas to understand the concept of momentum and why it's so important in collisions and explosions.

Let's start with Newton's First Law of Motion. It describes what happens to an object when the forces acting on it are balanced, meaning the resultant force is zero. The law states that if the resultant force on an object is zero, it will either remain stationary, or if it's already moving, it will continue to move at a constant velocity. This means a constant speed in a straight line.

This tendency of an object to stay in its state of rest or uniform motion is called inertia. Inertia is not a force; it's a property of matter. The more mass an object has, the more inertia it has, meaning it's harder to change its velocity. This is why it's much harder to push a lorry into motion than a bicycle.