🛑Inertia vs Momentum🎳
Inertia and momentum both relate to mass and motion, but they describe different things — one resists change, the other quantifies movement.
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🛑Inertia
- ✓The tendency of an object to resist changes in motion
- ✓Depends only on mass, not on velocity
- ✓A property, not a quantity with units
- ✓Greater mass means greater inertia
- ✓Explains why a heavy object is hard to start or stop
🎳Momentum
- ✓A measure of the motion an object carries
- ✓Depends on both mass and velocity
- ✓A vector quantity measured in kilogram-meters per second
- ✓Zero when an object is at rest
- ✓Conserved in collisions within a closed system
Verdict
Inertia is the resistance an object has to changing its motion; momentum is how much motion it actually has. A parked truck has high inertia but zero momentum until it starts moving.
Frequently asked
Does a resting object have momentum?+
No. Momentum depends on velocity, so a stationary object has zero momentum despite having inertia.
What is conservation of momentum?+
In a closed system the total momentum stays constant, even through collisions.
Does inertia depend on speed?+
No. Inertia depends only on mass; momentum is the quantity that also depends on velocity.
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