I'm pretty sure that gravity and inertia cause something to orbit around another object.
Gravity and Inertia.
An orbit is made possible by an equilibrium, or balance, of forces. Typically, this involves two forces: one of gravitational attraction between the objects and another caused by centripetal acceleration. At a given radius of orbit, a velocity can be found such that these two forces are equal, keeping the object in orbit.
Gravity, which pulls an object inward, and inertia, which resists gravity. They combine to form a more-or-less circular orbit.
Orbits are established by the combined effects of gravitational attraction and relative velocity. In other words, the moon, like any orbiting body, moves forward (tangent to its orbit) at a speed just sufficient to ensure that as it falls toward the earth due to gravity, it has moved far enough that the two motions combine to keep it at a roughly stable distance from the earth.
I'm pretty sure that gravity and inertia cause something to orbit around another object.
A sperm and an ovum (egg) are the two cells that combine to create a person. Fertilization is when these two cells combine.
Gravity and Inertia.
An orbit is made possible by an equilibrium, or balance, of forces. Typically, this involves two forces: one of gravitational attraction between the objects and another caused by centripetal acceleration. At a given radius of orbit, a velocity can be found such that these two forces are equal, keeping the object in orbit.
A tangential velocity vector relative to the orbit itself, and acceleration towards the center of the planet due to gravity.
Velocity and gravity (movement around the Earth and the gravity of the Earth pulling on it).
two
Two or more atoms combine to form a molecule.
The two principal motions of Earth are rotation and revolution. Rotation refers to the spinning of Earth on its axis, which causes day and night. Revolution refers to Earth's orbit around the sun, which takes approximately 365.25 days to complete.
Sugar and water
Cations and anions
Gravity, which pulls an object inward, and inertia, which resists gravity. They combine to form a more-or-less circular orbit.