Introduction Why do we hear music, voices, and even echoes? How does a tiny speaker fill an entire room with sound? The answer lies in sound waves—the invisible vibrations that
Introduction Why is water liquid, ice solid, and steam invisible? Have you ever wondered why a balloon expands when heated? Everything in the universe is made of matter, and matter
Introduction What makes a football fly when you kick it? Why does an apple fall from a tree? The answer lies in force—the fundamental interaction that drives motion, stops objects,
Introduction Have you ever wondered why your shoes don’t slip on rough ground but slide on ice? Or why car brakes work instantly when you press them? The answer lies
Introduction Did you know that air has weight and is constantly pressing down on us? Even though we don’t feel it, air pressure plays a vital role in our daily
Introduction Have you ever wondered why you see your reflection in a mirror or why a straw looks bent in a glass of water? These everyday phenomena happen because of
Introduction Have you ever used a screwdriver, ridden a bicycle, or opened a door with a handle? All these everyday objects are machines! Machines make our lives easier by reducing
Introduction Have you ever felt exhausted after lifting a heavy bag or pushing a stalled car? That’s because you’ve done work using your energy! Everything we do, from walking to