Angular Momentum: Keeping Planets on their Orbit

[mreq]

Hy.

What makes the planets to keep their position on the orbit (the same orbit). Shouldn't be attracted by the gravitation of the star ?

Thanks!

 

[fatra2]

Hi there,

To be very simple, their speed!

 

[sssmash]

they keep in their orbits due to the force of attraction or gravitational pull which depends on the distance of the planets and the radius of the orbits from each other and the sun.

 

[mreq]

And what give them the speed (motion)?

 

[mgb_phys]

And what give them the speed (motion)?

The angular momentum of the original spinning cloud of gas/dust that formed the solar system.

 

[mreq]

And why it doesn't stop ?

 

[Janus]

And why it doesn't stop ?

Newton's laws of motion.