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# How gravity is the force keeping the planets and the moon in their orbit.

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## Brandon Myers

on 4 January 2013

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#### Transcript of How gravity is the force keeping the planets and the moon in their orbit.

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Gravity Inertia How Gravity and Inertia work The gravity of the sun and the planets works together with the inertia to create the orbits. The gravity pulls the sun and the planets together, while keeping them apart. Together, this creates a rounded orbit as a form between the two forces. When one space object revolves around another, it is referred to as an orbit. The earth orbits the sun. Our moon orbits the earth. Many of the other planets in our solar system also have moons that orbit. Earth now has many man-made objects orbiting. Satellites are placed in orbit around the earth to assist with telephone calls, television, and other forms of communication. Astronauts have sometimes left debris orbiting our earth too. Gloves, tools, and other junk continuously orbit our earth; floating for an unknown period of time in space. How does Gravity and Inertia keep the planets in their orbits Because of gravity and inertia balancing each other, instead of traveling in a straight line, the Earth moves a little bit towards the sun with each moment. But it also keeps its perpendicular speed, so it also moves "sideways" to the sun with each moment. After 365 1/4 days it will be perfectly oval.
Gravity is a force of attraction between two objects. All objects with mass have gravity. Gravity is like a magnet. It pulls objects together. The Earth has gravity. Gravity holds everything close to this planet. Trees, water, animals, buildings, and the air we breathe are all held here by gravity. All of the planets, the stars and the moons of the universe have gravity. Mass is a measure of the number of atoms in an object combined with the density of those atoms. Usually people measure mass in kilograms. You can tell how much mass something has by measuring how hard it is to get that thing to change directions or slow down. On Jupiter Brandon would weigh 233.68 pounds. Weight is the force with which an object near the Earth or another body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull. The weight of an object in an aircraft flying at high altitude is less than its weight at sea level, since the strength of gravity decreases with increasing distance from the Earth's surface. Mass and Weight Inertia keeps the planets moving and spinning. Gravity is a force that attracts all objects toward each other. Inertia is a attraction of all objects and matter in the universe to remain still. To move an object that is at rest, a lot of force must be applied to overcome the object's inertia. The larger a still object is, the more force is required to move it. Conclusion In this prezi you learned about Inertia, Gravity, Orbits,How gravity and inertia keep the planets in their orbits, and mass and weight. And that's the end of this prezi. If you want to check your weight on other planets check out this website: http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/javascript/planet_hop.html Links http://idahoptv.org/dialogue4kids/season12/gravity/facts.cfm

http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/javascript/planet_hop.html

http://www.enotes.com/science/q-and-a/what-inertia-287528

http://science.yourdictionary.com/weight

And our Mircosoft paper Two multiple choice questions 1.What is one of the man-made things orbiting in space?
A. TV’s
B.Phones
C.Space Shuttle
D. Satellites

2.What is gravity?
A. A force
B. Brandon
C.Liquid
D.Inertia
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