An orbit is the curved path an object takes around another due to the balance between gravitational pull and its forward motion. Objects in low Earth orbit move forward at 5 miles per second while falling 32 feet per second due to gravity, resulting in a curved orbit. To achieve a higher or lower orbit, one must change the object's inertia by increasing or decreasing its speed. Sending objects straight up requires constant thrust, while orbits use less fuel as inertia keeps objects in motion. Orbits can be manipulated to intercept other celestial bodies like the Moon or planets using gravity-assisted maneuvers.
Digital Library of GLT Saraswati Bal Mandir. Gravitation is a natural phenomenon by which all physical bodies attract each other. It is most commonly experienced as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped.
Digital Library of GLT Saraswati Bal Mandir. Gravitation is a natural phenomenon by which all physical bodies attract each other. It is most commonly experienced as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped.
Presentation on gravitation for class 9th Rahul Shukla
It contains a brief description of gravitation with a video.
This presentation is with a deginer font and a classic theme.
It also consist a beautiful song
Discuss the law of universal gravitation and satellite motion.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Astronomers are gravity experts. All of the heavenly motions described in the preceding chapters are dominated by gravitation. Isaac Newton gets the credit for discovering gravity, but even Newton couldn’t explain what gravity was. Einstein proposed that gravity is a curvature of space, but that only pushes the mystery further away. “What is curvature?” we might ask.
This chapter shows how scientists build theories to explain and unify observations. Theories can give us entirely new ways to understand nature, but no theory is an end in itself. Astronomers continue to study Einstein’s theory, and they wonder if there is an even better way to understand the motions of the heavens.
The principles we discuss in this chapter will be companions through the remaining chapters. Gravity is universal.
Saeed Jafari
SUMMARY OF CHAPTER:-
Definition of Gravitation
Acceleration Due to Gravity
Variation Of “G” With Respect to Height And Depth
Escape Velocity
Orbital Velocity
Gravitational Potential
Time period of a Satellite
Height of Satellite
Binding Energy
Various Types of Satellite
Kepler’s Law of Planetary motion
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward (or gravitate toward) one another, including planets, stars and galaxies.
Since energy and mass are equivalent, all forms of energy, including light, also cause gravitation and are under the influence of it.
On Earth, gravity gives weight to physical objects and causes the ocean tides.
Presentation on gravitation for class 9th Rahul Shukla
It contains a brief description of gravitation with a video.
This presentation is with a deginer font and a classic theme.
It also consist a beautiful song
Discuss the law of universal gravitation and satellite motion.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Astronomers are gravity experts. All of the heavenly motions described in the preceding chapters are dominated by gravitation. Isaac Newton gets the credit for discovering gravity, but even Newton couldn’t explain what gravity was. Einstein proposed that gravity is a curvature of space, but that only pushes the mystery further away. “What is curvature?” we might ask.
This chapter shows how scientists build theories to explain and unify observations. Theories can give us entirely new ways to understand nature, but no theory is an end in itself. Astronomers continue to study Einstein’s theory, and they wonder if there is an even better way to understand the motions of the heavens.
The principles we discuss in this chapter will be companions through the remaining chapters. Gravity is universal.
Saeed Jafari
SUMMARY OF CHAPTER:-
Definition of Gravitation
Acceleration Due to Gravity
Variation Of “G” With Respect to Height And Depth
Escape Velocity
Orbital Velocity
Gravitational Potential
Time period of a Satellite
Height of Satellite
Binding Energy
Various Types of Satellite
Kepler’s Law of Planetary motion
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward (or gravitate toward) one another, including planets, stars and galaxies.
Since energy and mass are equivalent, all forms of energy, including light, also cause gravitation and are under the influence of it.
On Earth, gravity gives weight to physical objects and causes the ocean tides.
Tis ppt gives u a brief glance on the following topics:
Escape Speed
Earth Satellites
Geostationary And Polar Satellites
Weightlessness
If u want to download the ppt mail me to raviteja711@gmail.com
So what launch speed does a satellite need in order to orbit the earth? ... The motion of satellites, like any projectile, is governed by Newton's laws of motion.
Remember it's just a start for class 20 students. Just a way to declare hot to teach students of class by using the scope of ICT . It declares the scope of ICT in the field of education.
In this lesson, students will learn how gravity & friction can take affect on the simple things we do everyday of our lives. Learn the 3 main types of friction, & air resistance, plus a few examples. Finally, learn about terminal velocity & get a basic introduction to magnetic & electric forces with a slight distinction for buoyancy & density.
1. Believe it or not: The shortest distance between two points in space is a curved line if you are trying to save on fuel.
2. What is an orbit? An orbit is the path an object travels around a point. An orbit is also the balance between the pull of gravity on an object compared to the speed and direction of the object. An object in low Earth orbit is moving at 5 miles per second. The pull of gravity is 32 feet per second toward the Earth. The Earth curves 32 feet for every 5 miles you go out. So, if an object is moving at 5 miles per second, and in that time it falls 32 feet, and the Earth curves 32 feet for every 5 miles you go out, the spacecraft is still 32 feet above the Earth after the 5 miles it moved forward in one second.
3. Low Earth Orbit 5 miles forward and drop of 32 feet 5 miles forward and drop of 32 feet NOT TO SCALE
4. What would happen… In essence, you have a balance between Inertia (the force forward on the object) and the pull of gravity. To achieve a higher or lower orbit, what are you going to have to change? Do you change the inertia of the spacecraft or the gravity of the Earth? If you increase the inertia (push the spacecraft forward) it will achieve a higher orbit. If you decrease the inertia (slow the spacecraft down by firing rockets in the opposite direction of the orbit) it will achieve a lower orbit or fall to the surface.
5. Everything that goes up… In space a straight line may be the shortest distance between two points but it is also the most costly in fuel. If you want something to go straight up you will need to constantly push the object up. As the object goes up gravity wants to pull it down so you will need to keep pushing on it. You will constantly have to fire engines using up fuel and the fuel is heavy so you need more fuel to produce thrust to counter the weight….
6. If something is in orbit… One you have an object in orbit it will stay in orbit unless something happens to it. Remember Newton’s First Law of Motion: an object in motion tends to remain in motion unless acted upon by an outside force. So, once an object is in orbit you do not need to constantly push it forward. What happens if an object is in orbit and you add to its inertia?
7. Adding inertia When you add inertia (an engine burn in the direction of travel) the orbit will become elliptical and one end of the orbit will move farther away.
8. Putting this together: Instead of sending something to the Moon in a straight line, you can increase its orbit until the new orbit intercepts the Moon. Once it runs into the Moon’s gravity it will fall toward the Moon in a curved path putting it in orbit around the Moon.
11. What about other planets? The same process would be used to reach another planet.
12. Hoffman Transfer Orbit The Hoffman Transfer Orbit sends an object on a highly elliptical orbit that, if set up correctly, will intercept another object. This transfer orbit uses less fuel than traveling in a straight line but takes longer to get to your destination.
13. So… If you want to send a probe, lander or satellite way from the Earth you have to put it in a highly elliptical orbit. If you want it to have a stable higher orbit you will need to fire the engines in the direction of the new orbit when it reaches the proper distance from the Earth. To get to the Moon you will need to go 25,008MPH. To get to Mars you will need to go 94,891 mph.
14. And So: If you want to land something on Mars you are going to have to go from 94,000 miles per hour to zero in a very short period of time. Not only that but your spacecraft or you will have to survive these changes.
15. Credits A Crewed Mission to Mars... http://nssdc.gsfc.nasa.gov/planetary/mars/marslaun.html Apollo lunar landing launch window: The controlling factors and constraints http://history.nasa.gov/afj/launchwindow/lw1.html The Apollo Flight Journal: Lunar Orbit Rendezvous http://history.nasa.gov/afj/loressay.htm Flight to Mars: How Long? Along what Path? http://www-istp.gsfc.nasa.gov/stargaze/Smars1.htm