Acceleration works in direct proportion to force. This relationship is described by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, this is expressed as:
\[ F = m \cdot a \]
where \( F \) is the net force, \( m \) is the mass of the object, and \( a \) is the acceleration. Thus, when the force increases, the acceleration increases, provided that the mass remains constant.