3.1: Web Article - Force and Mass 3.1: Web Article - Force and Mass Copy these questions into your Lesson Three Journal and answer them as you read through this web article. 1. What is a force? 2. What is velocity? 3. What is a vector? 4. What unit is used to measure forces? 5. Watch the video embedded in this web article. a. What are contact and non-contact forces? b. Give two examples of each of these. 6. What does F = ma mean? 7. What is thrust? 8. What is drag? 9. What is dynamics? 10. What is mass? 11. What units are used to measure mass? 12. What is momentum