Final answer:
According to Newton's second law of motion, when a constant force is applied to an object, the acceleration of the object varies inversely with its mass. This means that if the mass of the object increases, the acceleration decreases, and vice versa.
Step-by-step explanation:
Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. In simpler terms, when a constant force is applied to an object, the acceleration of the object varies inversely with its mass. This means that if the mass of the object increases, the acceleration decreases, and vice versa. For example, if you push a heavy book and a light book with the same amount of force, the lighter book will experience a greater acceleration than the heavier book because its mass is smaller.