Reducing the strength of the strong force significantly increases the radius of the proton, with the relationship being exponential as the coupling constant decreases. If the strong force were to approach zero, protons would not exist, leading to quark confinement failure and the inability to form stable matter. The proton and neutron are similar in size due to their binding by the strong force, and both would become much larger if the strong force were weakened. In a scenario where the strong force is extremely weak, the hydrogen atom could still form a bound state, primarily governed by electromagnetic interactions. Overall, the dynamics of quark confinement and particle stability are heavily reliant on the strength of the strong force.