Inertia #science #stem #history #physics #gravity #education

Inertia is a property of matter that describes an object’s resistance to any change in its motion.

In simple terms:
• An object at rest tends to stay at rest.
• An object in motion tends to stay in motion at the same speed and direction
→ unless acted on by an external force.

This is Newton’s First Law of Motion.

Examples
• When a car suddenly stops, passengers jerk forward — their bodies want to keep moving.
• A book on a table doesn’t move unless you push it.
• A rolling ball keeps rolling until friction or another force stops it.

Key point
• More mass = more inertia
Heavier objects are harder to start, stop, or change direction.

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