Spec 0625
Revise CIE IGCSE Physics 6.1.2d Orbits and gravitational attraction with the question bank and revision guides.
Know that the Sun contains most of the mass of the Solar System and this explains why the planets orbit the Sun • Know that the force that keeps an object in orbit around the Sun is the gravitational attraction of the Sun • Supplement: Know that the strength of the Sun’s gravitational field decreases and that the orbital speeds of the planets decrease as the distance from the Sun increases • Supplement: Know that an object in an elliptical orbit travels faster when closer to the Sun and explain this using the conservation of energy
