About This Lesson

Welcome to Balanced, Unbalanced, Net Forces, the third lesson in Unit 3: Linear Dynamics.

This lesson connects the forces acting on an object to the way it moves.

How to Use This Lesson

1. Watch the teaching video
2. Complete the worksheet
3. Check your answers
4. Use the worked video solutions for any problems you want to review step by step

Teaching Video

In this video, I discuss the difference between balanced forces and unbalanced forces, and compare them to various motion types. I also discuss how and when to write a net force equation and work through several example situations.

Practice Materials

Use the resources below to practice the concepts from this lesson. Try to complete the worksheet on your own before checking the answer key.

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• Download Worksheet (3.03 Bal/Unbal/Fnet)
• Download Answer Key (3.03 Bal/Unbal/Fnet)

Worked Solutions

The videos below walk through each worksheet problem step by step.

Problem 1–2

Problem 3–4

Problem 5–6

Problem 7

Problem 8

Problem 9

Next Step
When you’re ready, continue to 3.04 Newton's Laws.