Newton's Second Law – AP Physics 1 | ShowMeClass

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Newton's Second Law

AP Physics 1 · Unit 2: Forces & Newton's Laws

Learning Objectives

Apply F = ma to solve for unknown quantities

Distinguish net force from individual forces

Predict how doubling F or m changes acceleration

Read and construct F-t and v-t graphs for constant force

Key Equations

Key Relationships

Double F → double a (linear relationship)

Double m → half a (inverse relationship)

Friction force = μₖ × N (opposes motion)

Newton's LawsForceAP Physics 1Unit 2

F_net0.0 N

a0.0 m/s²

v0.0 m/s

x0.0 m

t0.0 s

Applied Force F (N) 20 N

Mass m (kg) 5 kg

Friction coeff μₖ 0.20

Sim Speed 1×

Net Force0 N

Friction0 N

Acceleration0 m/s²

Time elapsed0 s

📝 Quick Quiz▼

1. A 4 kg block is pushed with 24 N; friction force is 4 N. Acceleration is:

6 m/s² 5 m/s² 7 m/s² 4 m/s²

2. If you triple the net force on an object of constant mass, the acceleration:

Stays the same Doubles Triples Quadruples

3. The normal force on a block on a horizontal surface equals:

The applied force mg (weight) mg − F_applied Zero