Earth Science: Physics and Technology – Electromagnetism Gravity-the fact that all objects attract each other in proportion to their mass—is familiar to everyone. In fact, life without it can hardly be imagined. Electricity and magnetism are different; even through the early 19th-century phenomena such as naturally magnetic minerals were scarcely known and not understood. Earth … Read more
Earth Science: Physics and Technology – Physics – Energy Even in ancient times or earlier, humans have been wondering about the matter of the world. The idea of four basic elements was widespread until the Middle Ages. These elements were fire, water, earth, and air. Modern physics poses the same question about nature and its … Read more
Facts At Your Fingertips: Energy and forces – What is energy? Energy is what makes everything happen. It cannot be created or destroyed, but it can be transferred. For example, kicking a ball transfers energy from the person to the ball. Energy can also be converted from one form to another—as when the chemical energy … Read more
