Physics Work & Energy KU 2024
PMDC Verified Question 7 of 108
A nurse is pushing a wheelchair with an 80 kg patient sitting on it. How much work is done by the patient's weight?
A
Half of the work
B
Maximum work
C
Minimum work
D
No work
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: No work
Concept:

Forces that act perpendicularly to the direction of displacement do zero mechanical work on the object.

Formula:

$$ W = Fd \cos \theta $$

Solution:

  • The wheelchair moves horizontally across the floor.


  • The patient's weight (gravity) acts vertically downward.


  • The angle \( \theta \) between horizontal displacement and vertical weight is 90°.


  • \( \cos(90^{\circ}) = 0 \), so Work = 0 J.


Why other options are incorrect:

While the nurse does work pushing forward against friction, the weight vector itself does not contribute to or oppose the horizontal motion.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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