Planets and forces

Radian: the angle subtended at the centre of a circle by an arc of length equal to the radius of the circle.
Centrepetal force: net force moving on an object in a circle.
Newton's law of gravitation: any two point masses attract each other with a force directly proportional to the product of their masses and inversley proportional the the square of their seperation.
Gravitational feild strength: the gravitational force exterted per unit mass of a small object placed on that point.
1. G=Fm
Kepler's 3rd law of planetary motion: the t squared of a planet is proportional to r cubed from the sun.
Feild: the region of space surrounding a body where other bodies feel a force due to it.
F=GMm/r2 - the force of attraction between 2 masses.
Geostationary satelites have a 24 hour orbit.

Resource summary

	Created by kangarew97 about 10 years ago