Final answer:
The third step in checking the musculoskeletal system might involve assessing the range of motion and performing a physical examination of joints and muscles, looking for pain, resistance, or abnormalities.
Step-by-step explanation:
The third step to check for the musculoskeletal system is not explicitly stated in the provided reference material. However, given the context of musculoskeletal system assessments, a logical third step after identifying the involved forces and potential energy from work done by these forces would be to assess the range of motion and physical examination of the joints and muscles. This could include observing the symmetry, alignment, and physical appearance of the limbs, and testing the joint's range of motion by moving it through its normal movements to check for pain, resistance, or any abnormalities in function. Moreover, palpation of muscles for tenderness or abnormal muscle tone might be involved in this assessment step.
Injuries or diseases such as arthritis can severely limit mobility and may require treatments like joint replacement surgery in severe cases. It is thus important to thoroughly examine and assess the musculoskeletal system to ensure proper function and diagnose any potential issues early.