AP Physics 1: Algebra-Based 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 11 cards to help you master important concepts.
Does a zero net force on an object mean the object must be at rest?
No. A zero net force means the object's velocity is constant, which includes being at rest (v=0) or moving at a constant, non-zero velocity.
Card 1 of 11
All Flashcards (11)
Does a zero net force on an object mean the object must be at rest?
No. A zero net force means the object's velocity is constant, which includes being at rest (v=0) or moving at a constant, non-zero velocity.
Why is Newton's First Law tested from an inertial reference frame?
An inertial reference frame is, by definition, one where Newton's First Law holds true; observations from a non-inertial (accelerating) frame would not verify the law.
What is an 'inertial reference frame'?
An inertial reference frame is a perspective or coordinate system from which an observer would verify that Newton's first law of motion is valid.
A satellite drifts through deep space with a constant velocity. What is the net force on the satellite?
Since the satellite's velocity is constant, the net force exerted on it must be zero, according to Newton's First Law.
What is 'translational equilibrium'?
Translational equilibrium is a state in which the net force exerted on a system is zero.
What is the relationship between translational equilibrium and constant velocity?
According to Newton's First Law, if a system is in translational equilibrium (zero net force), its velocity must be constant.
A book is at rest on a tabletop. Is it in translational equilibrium? Explain using Newton's First Law.
Yes, it is in translational equilibrium. Because its velocity is constant (zero), Newton's First Law implies that the net force on the book must be zero.
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.
Define 'net force'.
The net force on a system is the vector sum of all individual forces exerted on that system.
How is the concept of 'net force' crucial to understanding Newton's First Law?
Newton's First Law is entirely dependent on the net force; it is the condition of zero net force that leads to the outcome of constant velocity.
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.