Question

multiple choice 1 point
if a rocket does not move immediately after ignition, which law explains this delay?
second law - force and acceleration
first law - inertia
law of universal attraction
third law - action and reaction

Explanation:

Newton's First Law (Law of Inertia) states that an object at rest will remain at rest unless acted upon by an external force. The rocket, initially at rest, doesn't move immediately after ignition because it needs a sufficient force (from the engines) to overcome its inertia. The Second Law relates force, mass, and acceleration ($F = ma$), but the key here is the concept of inertia (rest state persistence). The Law of Universal Attraction is about gravitational force between masses. The Third Law is about action - reaction pairs (e.g., exhaust pushing down, rocket pushing up), but the delay is due to inertia (First Law), not the action - reaction mechanism itself.

Answer:

First Law – Inertia