Question Detail
Question
The extended work-energy theorem that includes nonconservative forces states that the work done by nonconservative forces (W_nc) is equal to what?
Correct Answer
Option C is the correct answer.
Detailed Explanation
When nonconservative forces are present, mechanical energy (KE + PE) is not conserved. The work done by these nonconservative forces accounts for the change in total mechanical energy: W_nc = ΔKE + ΔPE = E_f - E_i. If W_nc is negative, mechanical energy is lost (e.g., to heat).
Hint
This theorem links the work of forces like friction to the overall change in the system's mechanical energy.