Final answer:
In weightlifting, force should be applied sequentially from proximal to distal when accelerating an object like a barbell. This ensures efficient transfer of force, proper technique, and safety.
Step-by-step explanation:
In weightlifting, the biomechanical principle that affects the movement of the barbell is that the force applied to accelerate the object should always be applied sequentially from proximal to distal. This means that the force should start from the closer end of the barbell (proximal) and then move towards the farther end (distal).
Applying force sequentially from proximal to distal allows for efficient transfer of force and ensures proper technique and safety in weightlifting. It also allows for better control and stability of the barbell.
For example, when performing a bench press, the force should be focused on pushing the barbell from the chest towards the arms, rather than pushing it away from the arms towards the chest.