The energy produced by the star, which manifests itself as heat.
No an nebula is held together by the balance of the inward force of gravity and outward pressure.
The four factors are pressure gradiant force, coriolis force, friction force and gravity. Pressure gradient force move airs of higher pressure to lower pressure. Coriolis force prevents anything from moving in a straight line to earths oblate sphere. Friction rides the wind and without it air would travel parellel. Gravity because the power of gravity pulls air down.
If it doesn't move, it doesn't accelerate; therefore the net force must be zero.
Pressure= Force/Area Pressure of a Liquid is density times gravity times height
Force exerts pressure. For example: At the surface of the Earth the column of air in the atmosphere above an area has a mass that exerts a force (due to gravity) on that surface area.
A force that resists motion is inertia.
Gravity.
In order for water to reach your sink, pressure needs to be exerted for it to beat gravity's force.
Gravity!
gravity
air pressure
gravity
The pedals could be one but none thing really resists a pulling force because gravity is a pulling force that acts on everything that has weight.
No an nebula is held together by the balance of the inward force of gravity and outward pressure.
F(gravity) pulls a movable object toward the center of mass (generally the Earth). F(friction) resists F(gravity) when the object is scraping against something that is solidly attached to the mass (Earth).
pressure
Another force.