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⚙️ Newton's Second Law: Forces, Mass, and Acceleration

Build free-body diagrams, add force vectors, and use Newton's second law to predict acceleration without confusing mass, weight, normal force, or friction.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Build the modelChoose a system and represent its external interactions as vectors.A clear system boundary and free-body diagram keep force bookkeeping physically meaningful.
Compute the net forceAdd force vectors and use mass and components to predict acceleration.Net force is directional: add components, then relate the result to acceleration through mass.
Model contact forcesUse normal force and friction models without treating special cases as universal.Contact forces depend on geometry, acceleration, and whether surfaces stick or slide; equations should follow the diagram.

Questions this course answers

What does Fnet represent?

Net force is the signed or vector sum of all relevant external forces on the chosen system.

If net force is zero, what is the acceleration?

Fnet = ma, so zero net force gives zero acceleration for a finite mass.

For fixed net force, what happens when mass doubles?

Because a = Fnet/m, doubling the denominator halves the acceleration.

Why resolve an angled force into components?

Components let Newton's second law be applied independently in perpendicular directions.

Which statement about static friction is correct?

Static friction matches the needed opposing force until its maximum limit is reached.

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