AP Physics C: Mechanics Flashcards: Newton's First Law
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is Newton's first law of motion?
Newton's first law states that if the net force exerted on a system is zero, the velocity of that system will remain constant.
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What is Newton's first law of motion?
Newton's first law states that if the net force exerted on a system is zero, the velocity of that system will remain constant.
An observer confirms that an object with zero net force on it maintains a constant velocity. What does this say about the observer's reference frame?
This confirmation indicates that the observer is in an inertial reference frame.
What is the mathematical equation that represents translational equilibrium?
The equation for translational equilibrium is $\sum\vec{F}_{i}=0$, which states that the vector sum of all forces on the system is zero.
Define translational equilibrium.
Translational equilibrium is the state where the net force exerted on a system is zero.
What is the primary condition required for Newton's first law to apply?
The primary condition is that the net force exerted on the system must be zero.
What is an inertial reference frame?
An inertial reference frame is a perspective or location from which an observer would verify Newton's first law of motion.
Under what condition does a system's velocity remain constant?
A system's velocity remains constant when the net force exerted on it is zero.
How does translational equilibrium relate to Newton's first law?
Newton's first law describes the outcome (constant velocity) of a system being in a state of translational equilibrium (zero net force).
If a car is driving at a constant velocity, what can be concluded about the net force acting on it?
Based on Newton's first law, if the car's velocity is constant, the net force exerted on it must be zero.
What does the equation $\sum\vec{F}_{i}=0$ imply about an object's motion?
This equation implies the object is in translational equilibrium, and therefore its velocity will remain constant.