Motion: Forces

Forces are a big part of physics. Physicists devote a lot of time to the study of forces that are found everywhere in the universe. The forces could be big, such as the pull of a star on a planet. The forces could also be very small, such as the pull of a nucleus on an electron. Let's look at the forces acting on that soccer ball before you kicked it. If there is more than one force acting on an object, the forces can be added up if they act in the same direction, or subtracted if they act in opposition. There is one totally important formula when it comes to forces, F = ma. Or search the sites for a specific topic.

Planet Facts: Interesting Facts about the Eight Planets Order of the planets The order of planets from closest to farthest from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The largest planet is Jupiter, followed by Saturn, Uranus, Neptune, Earth, Venus, Mars and, the smallest planet, Mercury. If you include dwarf planets as well, the planets in order becomes Mercury, Venus, Earth, Mars, Ceres, Jupiter, Saturn, Uranus, Neptune, Pluto, Haumea, Makemake and Eris being the furthest from the Sun. Distance of the planets from the Sun For the distances between each of the planets, see our distances between planets calculator. You can also calculate your weight on other planets. Types of planets The planets fall into two categories based on their physical characteristics: the terrestrial planets and the gas giants. Planet facts Click any of the eight planets below to find out more about the remarkable objects in our solar system. What is a planet? The answer to this question is a highly controversial one.