All objects moving or not moving resist changes in motion.
Newton's First Law of Motion
Newton's first law of motion is the law of inertia. Inertia is the resistance of an object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an outside force.
Objects in motion stay in motion. Objects at rest stay at rest.
Unless acted upon by an unbalanced force.
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Examples of Inertia
Objects at Rest....Stay at Rest |
Objects in Motion....Stay in Motion! |
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More Mass = More Inertia
The amount of inertia that an object has depends on the object’s mass. The more mass an object has the more inertia it has.
If an object has a large amount of inertia (due to a large mass):
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Inertia and Gravity Keep Objects in Orbit....Thanks Inertia!
Inertia is NOT a Force!
Inertia is a property of all matter. Inertia does not push or pull anything.
Video Guide:
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Topic Tips
- All matter resists ANY changes in motion.
- Objects at rest stay at rest. Objects in motion stay in motion unless acted upon by unbalanced force(s).