How can a spaceship be speeded up by taking revolution around a planet, like nansa does?

Question

Without violating energy conservation, how can it be possible?

Answer 1

Diagrams in physics texts show a ball rolling down one side of a bowl and coming up the other to the same height (less if there is friction.) At first thought, a spacecraft passing near a planet and coming out the other side looks like the same situation. If so, how can the spacecraft come out faster (i.e. like the ball going up higher on the far side)?
The difference in the situations is that the planet is moving. The spacecraft gets a little kinetic energy from the planet. (If the bowl were moving in the original example, the ball could leave faster than it came in.)
With the gravitational assist / slingshot effect that NASA uses, there is no violation of conservation of energy. The planet slows (a tiny bit!) and the spacecraft's speed increases. Total kinetic energy is the same before and after.

Answer 2

The planet must be other than Earth. The space ship starts out chasing the planet along the path of the planet's orbit. The space ship spends a lot of time chasing the planet because they are both going the same direction. The space ship speeds up because it is "falling" into the planet. The planets gravity pulls the space ship faster. The space ship overtakes the planet between the sun and the planet. The space ship partially orbits the planet. Next the space ship is in front of the planet and facing away from the sun. The space ship now leaves the planet traveling away from the sun. The planet's gravity is now slowing the space ship. But the slowing phase does not last as long as the chasing phase so there is a net gain of speed. The planet has slightly been slowed down by this process.

Answer 3

I think you are reffering to what is called a "gravitational slingshot." A gravitational slingshot is the use of the gravity of a planet to alter the path and speed of an interplanetary spacecraft. It was first developed in 1959 at the Department of Applied Mathematics of Steklov Institute and employed in Luna 3 Moon mission.[1] It is a commonly used maneuver for visiting the outer planets, which would otherwise be prohibitively expensive, if not impossible, to reach with current technologies. It is also known as a "gravity assist". A slingshot maneuver around a planet changes a spacecraft's velocity relative to the Sun, even though it preserves the spacecraft's speed relative to the planet (as it must do, according to the law of conservation of energy). To a first approximation, from a large distance, the spacecraft appears to have bounced off the planet (an elastic collision).

Answer 4

well there is no voilation of conservation of energy.

the concept here it to use the gravity of another planet possibly a big one to move towards that planet, this gravity gives acceleration. but the trick here lies in escaping the gravity bcos the speed should be high enough to escape.
something like escape velocity used for getting objects out in space. if u can follow that concept.

well this object when accelerated by a huge natural planet like jupiter its carefully again deflected away using some technique, so that it doesnt crash into the planet.

this the important trick of deflection hence no laws of conservation of energy are voilated.

and our purpose of saving some fuel is also accomplished.

well about using this technique for a space ship
the answer is tricky
this can be done but not when its in earths atmosphere, the spaceship should be sufficiently near to the other planet to get this effect of gavity. so infact it has to be in outer space to get accelerated.

sorry about typo... if any
urs
mohnkhan
http://www.mohitech.com

Answer 5

It is because of centrifugal force, along with sling shot effected(tangential component of the vector).

Try this out.

Experiment.

Go out in the open, with a small pig pong ball at the end of a long string. Make sure no one is there around you ware personal protection (safety glasses). 3 inches from the ball put a cut in the string but do not cut it completely, hold the string in your hand at the other end from the ball, extend your hand over your head, making sure that ball stays over the head start spinning the ball in a circular orbit, at a point string will break and ball will fly on its own very fast.

PS:
Karla and Roy E both have given you good detail explanation, of how it is done in space, with a space craft.

Answer 6

Simple. Space shuttle is sent near to the planet and simultaneously horizontally force is applied. According to energy of conservation, the gravitational force is converted to kinetic energy and horizontal force is added to it and obviously it is sped up. In this universe conservation of energy cannot be violated.

Answer 7

The space shuttle use the gravitational pull of the earth to throw it self forward....Mush like a sling shot or yo yo spin it harder it hurts more.

Answer 8

nansa 911? i watch that show all the time. i need them for my disorderly space ships.

Answer 9

what or who is nansa?