Physics Force & Motion BUMHS 2024
PMDC Verified Question 22 of 137
Gravitational mass of a body is
A
F/a
B
Fa
C
W/g
D
Wg
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: W/g
Concept:

Distinguishing between inertial mass and gravitational mass formulas.

Solution:

  • Gravitational mass measures an object's precise response to a gravitational field, dictating its weight.


  • The weight formula is \( W = m_gg \).


  • Rearranging for gravitational mass gives \( m_g = \frac{W}{g} \).


Why other options are incorrect:

\( F/a \) calculates strictly inertial mass (resistance to general acceleration). While experimentally equivalent to gravitational mass, its formulaic definition arises from Newton's Second Law, not gravitation.

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