Physics Force & Motion ETEA 2022
PMDC Verified Question 70 of 137
Law of inertia satisfies:
A
Condition of equilibrium
B
Condition of variable force
C
Condition of force in contact
D
Condition of conservation of mass
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Condition of equilibrium
Concept:

The Law of Inertia (Newton's First Law) applies exclusively when the net external force on a system is strictly zero.

Solution:

  • When the sum of all forces acting on an object is zero (\( \Sigma F = 0 \)), the object is in a state of translational equilibrium.


  • Because the law of inertia describes motion precisely under this \( \Sigma F = 0 \) condition, it inherently satisfies the first condition of equilibrium.


Why other options are incorrect:

Variable forces or contact forces induce acceleration, violating the premise of inertia. Mass conservation is a separate principle altogether.

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