Introduction:
When considering the impact of two identical bullets, one fired from a light rifle and the other by heavy rainfall, it is important to understand the concept of force and its effects on the body. This analysis will explore which bullet would hurt the shoulder more and why.

Force and its Impact:
Force is a physical quantity that can cause an object to accelerate, deform, or change its motion. When a force is applied to an object, it can result in varying degrees of damage depending on the magnitude and duration of the force.

Light Rifle Bullet:
- A bullet fired from a light rifle possesses a significant amount of force due to the combustion of gunpowder within the firearm.
- The bullet accelerates rapidly and exits the barrel at a high velocity.
- As the bullet impacts the shoulder, the force is transferred to the body over a short duration.
- Due to the high velocity and concentrated force, the impact can cause significant discomfort, bruising, and even injury to the shoulder.

Heavy Rainfall Bullet:
- A bullet created by heavy rainfall does not possess the same amount of force as a light rifle bullet.
- Raindrops falling from the sky have a relatively low velocity and do not concentrate their force in a specific area.
- The impact of raindrops on the shoulder is spread out over a larger surface area and longer duration.
- While the raindrops may cause some discomfort, they are unlikely to cause significant injury or damage to the shoulder.

Conclusion:
In conclusion, the bullet fired from the light rifle would hurt the shoulder more compared to the bullet created by heavy rainfall. The light rifle bullet possesses a higher velocity, concentrated force, and shorter duration of impact, leading to more potential for discomfort, bruising, and injury. On the other hand, the bullet created by heavy rainfall has a lower velocity, dispersed force, and longer duration of impact, resulting in minimal discomfort and a lower risk of injury.