Definition

1. Noun (Physics): Newton's first law of motion is a fundamental principle of classical mechanics. It states that an object will remain at rest, or continue moving in a straight line at a constant speed, unless it is acted upon by an unbalanced external force. This law is also known as the law of inertia.

Usage

This term is used in scientific, educational, and technical contexts to describe the basic behavior of objects related to force and motion. * It is a proper noun and is typically capitalized as Newton's First Law of Motion. * It is often introduced with verbs like states, describes, or defines.

Examples

• In a textbook: "Newton's first law of motion explains why passengers lurch forward when a bus stops suddenly."
• In a lecture: "According to Newton's first law of motion, a hockey puck sliding on frictionless ice would never stop."
• In an explanation: "The concept of inertia, which is the focus of Newton's first law of motion, is experienced every day."

Advanced Usage

• "To demonstrate Newton's first law of motion": To perform an experiment or give an example that illustrates the principle.
  • The teacher used a smooth table and a puck to demonstrate Newton's first law of motion.
• "As described by Newton's first law of motion": Used to connect an observation back to the scientific principle.
  • The spacecraft continued its journey through empty space, as described by Newton's first law of motion.

Variants and Related Words

• The Law of Inertia: This is the most common alternative name for Newton's first law of motion. "Inertia" refers to an object's resistance to changes in its state of motion.
• Newton's First Law: A common shortened form.
• Inertia (n): The property of an object, described by the first law, to resist changes in velocity.
  • The inertia of the large ship made it slow to turn.
• Newtonian Mechanics (n): The system of physics based on Newton's laws of motion and gravitation.

Synonyms

• The law of inertia: (Direct synonym, see Variants above)

Related Concepts (Not Phrasal Verbs or Idioms)

• Newton's Second Law of Motion: Defines the relationship between force, mass, and acceleration (F=ma).
• Newton's Third Law of Motion: States that for every action, there is an equal and opposite reaction.
• Force (n): An interaction that can change the motion of an object; the external agent mentioned in the first law.
• Equilibrium (n): The state where the net force on an object is zero, resulting in no change in motion (a special case of the first law).

Noun

1. a body remains at rest or in motion with a constant velocity unless acted upon by an external force