A ramp is a machine that decreases the force required to move an object while increasing the the object travels.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

what is the actual question though?

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.