Weather results from the interaction of many forces.
When discussing these interactions we are concerned with the direction and magnitude, or strength, of the force exerted on an object. These two factors, represented in diagrams by arrows, determine what effect the force has on the object. The arrow points in the same direction as the force. Two or more forces can act to pull or push at the same point on a body. These forces can be replaced by a single force, the net force or resultant, which reproduces the same effect on the body as the separate forces.