The world and the Universe are action-packed. People and animals are always on the move. The planets are constantly circling the Sun. Are there any rules to all this activity? Yes! Our world and the whole Universe are governed by the laws of nature. Scientists who try to understand and learn about these laws are called physicists. Here are some questions that physicists across history have wondered about: When you drop a ball, why does it fall on the ground? Why doesn’t it float up? If you spin a top, why doesn’t it spin forever? Why does it eventually stop? Maybe you have wondered about these things, too.
To answer those questions, physicists needed to discover the laws of motion. What is motion? Motion is movement in any direction. You can move up, down, forwards, backwards, and sideways. You can move in circles. You can wiggle, wave, twist, turn, roll, flip, sway, bend, pivot, shake, and spin.
3 Topics in this unit
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Force, Motion, and Friction
The world and the Universe are action-packed.
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Gravity and Magnetism
Some forces are invisible and can make objects move without touching them.
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Newton's First Law of Motion
Isaac Newton was a famous scientist who was interested in all sorts of things, from gravit ...
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