A LITTLE LIGHTBULB MOMENT
Physics: mechanics, fluids and thermodynamics
Newton’s second law: force and acceleration
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More shove, less mass, bigger speed change
The idea behind the cue
Newton’s second law says net force equals mass times acceleration. For a fixed mass, more net force produces more acceleration; for a fixed force, more mass produces less acceleration.
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Short & simple
More shove, less mass, bigger speed change
Acronym
NMA — Neon Moose Applaud.
Story
Two carts get the same push. The empty cart leaps forward; the loaded cart barely budges. Same shove, more mass, smaller acceleration.
Connect the pieces
- N (Neon) → Net force: Use the total force on the object, not just one applied force.
- M (Moose) → Mass: For a fixed net force, more mass means less acceleration.
- A (Applaud) → Acceleration: For a fixed mass, more net force gives more acceleration, and force and acceleration are vectors.
- Neon · Net force: Use the total force on the object, not just one applied force.
- Moose · Mass: For a fixed net force, more mass means less acceleration.
- Applaud · Acceleration: For a fixed mass, more net force gives more acceleration, and force and acceleration are vectors.
Know the limits
Use net force, not a single applied force; direction matters because force and acceleration are vectors.
Further reading · OpenStax science textbooks ↗Check your understanding
A constant net force acts on two objects, one light and one heavy. Which object has the larger acceleration?
A. The heavier object
B. They accelerate equally
C. Neither accelerates because force is constant
D. The lighter object
Reveal explanation
The lighter object
With the same net force, acceleration is inversely proportional to mass, so the lighter object accelerates more.