Physics Force & Motion SZABMU 2024
PMDC Verified Question 1 of 137
The quantity of motion present in a body can be measured by ____.
A
Acceleration
B
Momentum
C
Speed
D
Velocity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Momentum
Concept:

Historical definitions of physical quantities by Isaac Newton.

Solution:

  • Newton originally coined the phrase "quantity of motion" to describe how hard it is to stop a moving object.


  • Because stopping power depends heavily on both the object's mass and its velocity, the exact physical measure is momentum (\( \vec{P} = m\vec{v} \)).


Why other options are incorrect:

Velocity and speed describe how fast it moves, but completely ignore the mass. A speeding bullet and a speeding train have the same speed, but vastly different "quantities of motion" (momentum).

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