True: Scientists study biomechanics so they can better understand how physics operates.
However, your question seems to have multiple options regarding the focus of biomechanics. The most accurate statement regarding the purpose of studying biomechanics is:
False: Scientists study biomechanics so they can better understand how the body operates.
Biomechanics specifically deals with the mechanical principles of living organisms and how they move. So, the best answer reflecting the true purpose of biomechanics would be the last option you provided.