Final answer:
Acceleration is directly proportional to the net force on a glider, as defined by Newton's Second Law of Motion.
Step-by-step explanation:
The relationship between acceleration and the net force on a glider is directly proportional. This means that when the net force acting on the glider doubles, the acceleration doubles as well. This relationship can be explained by Newton's Second Law of Motion, which states that acceleration (a) is equal to the net external force (Fnet) divided by the mass (m), or expressed in the equation a = Fnet/m. Therefore, if the net force increases while the mass remains constant, the acceleration will increase in direct proportion to the net force.