# Gravitational Slingshot Effect

## Main Question or Discussion Point

And when an object passes near from a planet, why it doesn't start orbiting around the planet?
Why the object is pushed away even when there is attractive force (Gravity) between object and planet ..?

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tiny-tim
Homework Helper
Hi Ali!

Relative to a planet, a body must follow a hyperbola a parabola or an ellipse.

Which, depends on its energy.

A body with too much energy will follow a hyperbola, which means that its directions at "+∞" and "-∞" (which will be along asymptotes of the hyperbola) will be different … the closer it goes to the planet, the greater the angle between the asymptotes, and so the greater the "slingshot" effect.

Thanks Dear.
Please also explain that why the object doesn't orbit around the planet...?
Which force(s) pushes it away from the planet even when Gravitational Attraction is present between the object and the planet.

berkeman
Mentor
And when an object passes near from a planet, why it doesn't start orbiting around the planet?
Why the object is pushed away even when there is attractive force (Gravity) between object and planet ..?
Thanks Dear.
Please also explain that why the object doesn't orbit around the planet...?
Which force(s) pushes it away from the planet even when Gravitational Attraction is present between the object and the planet.