That and the magnetic force
gravity/rotation
To stay up in space. Gravity.
orbits of the planet around the sun
The earth's rotation and orbital motion is responsible for the days and nights on the planet. This movement is also responsible for the changes in the seasons.
Rotation around the planets central axis.
The rotation of the planet on its axis of spin. The spin is responsible for the day and the night.
Yes because if a Star has a planet the gravity of the planet will rock it back and forth
That would be gravity and inertia.
The gravity of Earth pulls the water onto the surface of the planet and is responsible for some of the propagation of waves. The gravity of the Moon and Sun pull on Earth's water and are responsible for the tides.
Gravity for the real motion, the Earth's rotation for the apparent motion.
It is necessary for a planet to rotate around a sun, or other large mass, because it is what allows the planet to stay at a fairly consistent distance away from the larger mass. If there was no rotation, the planet would go hurtling toward the mass. The rotation adds an outward acceleration to counteract the force of gravity from the larger mass.
The motion of a planet about it axis is called the rotation of a planet.