By Paul Fleisher
Explains the physics of gravity and gravitational pull, providing info at the contributions made during this zone via Copernicus, Galileo, and Newton.
Read Online or Download Objects in Motion: Principles of Classical Mechanics (Secrets of the Universe) PDF
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Additional resources for Objects in Motion: Principles of Classical Mechanics (Secrets of the Universe)
The second law of motion is often known as the law of acceleration. It is usually stated like this: The acceleration of an object is directly proportional to the force applied to the object and inversely proportional to the mass of the object. Before we go on, it’s important to understand what directly proportional and inversely proportional mean. They are not as difficult as they may sound. If two measurements are directly proportional, then when one increases, the other increases too. For example, if you are driving at 80 kilometers (50 miles) per hour, the distance you cover is directly proportional to the amount of time you drive.
In the law of universal gravitation, as the distance between two objects increases, the amount of gravitational force decreases. Gravitational force decreases by the square of the distance between the two objects. When you square a number, you multiply it by itself. The square of 2 is 2 × 2, or 4; the square of 3 is 3 × 3, or 9. The symbol used to indicate that a number is squared is a small 2 placed at the upper right of the number. That 2 is called an exponent. It tells you how many times to multiply the bigger number by itself.
But the natural laws that explain how the shuttle takes off, moves through the Earth’s atmosphere, and orbits the Earth were discovered by the man who may have been the greatest scientist who ever lived—Sir Isaac Newton. When the space shuttle leaps into orbit, or when anything else in our Objects in Motion 30 universe moves, it moves according to the laws that Newton discovered and wrote down in the late 1600s. The universe is filled with moving objects. Wheels roll, birds and planes fly, trees sway in the breeze.