Newton's First Law
An object at rest stays at rest unless acted upon by an external force.
Also: law of inertia
Definition
Newton's First Law of Motion, also called the law of inertia, states that an object will remain at rest or move in a straight line at constant velocity unless acted upon by a net external force. This principle explains why passengers lurch forward when a car brakes suddenly. It forms the foundation of classical mechanics.
Example
“A hockey puck sliding on frictionless ice continues moving in a straight line indefinitely until it hits a wall or another force acts on it.”
Usage Examples
- 1
“The team applied newton's first law best practices to improve their physics outcomes significantly.”
- 2
“Understanding newton's first law is essential for anyone building a career in STEM.”
When & How to Use
Use 'Newton's First Law' when working in Physics contexts where newton's first law of motion, also called the law of inertia, states that an object will remain at rest or move in a straight line at constant velocity unless acted upon by a net external force.
- ▸Applying newton's first law principles during a physics project or initiative
- ▸Explaining newton's first law to a junior team member or stakeholder unfamiliar with STEM
- ▸Evaluating options or proposals using newton's first law as a decision-making criterion
Etymology & Origin
The term 'Newton's First Law' derives from professional usage and entered STEM professional usage as the field formalised in the 20th century.
History & Evolution
The concept of newton's first law has evolved alongside STEM. Early practitioners relied on informal methods; structured approaches emerged with the professionalisation of physics in the mid-20th century. Today, newton's first law is a standard part of STEM practice globally.
Synonyms
- law of inertia
- first law of motion
- principle of inertia
Images
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Related Terms
- Newton's Second Law
- Newton's Third Law
- Inertia
- Force