Newton's First Law of Motion
Learning Objectives
- Students will understand the concept of inertia
- Students will identify balanced and unbalanced forces
- Students will apply Newton's first law to explain motion
Core Concepts
- Inertia: resistance to changes in motion
- Balanced forces: net force is zero
- Objects maintain uniform motion unless forces change them
Formulas
$$\text{If } F_{net} = 0, \text{ then } a = 0$$
Newton's first law in equation form
Interesting Fact
Newton's first law is sometimes called the law of inertia
Key Scientist
Galileo Galilei
Precursor concepts about inertia and motion
Modern Research
Inertia is key to designing spacecraft trajectories — once in space, a craft continues without propulsion, using gravity assists to change direction.
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