Physics Work & Energy UHS 2024
PMDC Verified Question 9 of 108
Which of the following is a non-conservative force?
A
Frictional force
B
Electric force
C
Elastic spring force
D
Gravitational force
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Frictional force
Concept:

A conservative force is one where work done depends only on initial and final positions, not the path taken. A non-conservative force dissipates energy based on the path length.

Formula:

$$ W_{\text{closed loop}} \neq 0 \quad (\text{For non-conservative forces}) $$

Solution:

  • Electric, elastic spring, and gravitational forces have associated potential energies. Energy put into them is fully recoverable.


  • Frictional force opposes motion along any path, turning kinetic energy into irrecoverable heat. Thus, it is non-conservative.


Why other options are incorrect:

Options B, C, and D are textbook examples of conservative fields.

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