Physics – 1.2 Motion | e-Consult

One factor that could explain this is that Block A has a greater mass than Block B. Mass is a measure of the amount of matter in an object. A larger mass means the object has more inertia, resisting changes in motion. Therefore, a greater mass requires a larger gravitational force (weight) to produce the same acceleration. Since the balance measures the force required to balance the blocks, a greater mass will result in a greater downward force being needed to maintain equilibrium.