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Name: Test Three: Forces and motion study guide 1. Define Motion. 2. What is a reference point? 3. What is speed when talking about motion? 4. What is the formula for speed? 5. What are the units for speed? 6. What is the difference between Instantaneous speed and average speed? 7. Give a situation where you would want to measure each of these? a. Instantaneous Speed b. Average Speed 8. What is the difference between Speed and Velocity? 9. What is the difference between speed and acceleration? 10. What is the formula for acceleration? 11. What are the units of acceleration? 12. How can you describe each of the following? a. Positive acceleration b. Negative acceleration Graphing Motion: 1. Consider a Distance - Time Graph (like this) What does each of the following tell us about the data presented in this graph: a. Slope : b. Steeper Slope : c. Straight line on the left: d. Flat Line: 2. In a distance time graph acceleration is shown with a _______________________ 3. Looking at the graph above answer the following questions: a. Which object has the most constant positive speed for the entire ten seconds? b. Which object accelerated the fastest at any given time? c. Which object was stopped the longest? d. Which object shows acceleration? e. Which object decelerates for the longest amount of time. 4. When considering a Speed - time graph (like below); Answer the following: a. Slope of the line tells us: b. A positive slope means: c. A negative slope means: d. a Straight line means: e. a flat line means: f. Where on this graph is there speeding up of the object? g. Where on this graph is there slowing down of the object? h. Where is there no acceleration? Forces 1 Define force: 2. What are the two types of forces we can talk about and explain: a. b. 3. Newtons first law ties together the ideas of forces and motion. Please restate newtons first law in the space below: 4. Newton’s first law is also called : 5. As mass increases, Inertia also ________________ 6. Define friction. 7. Friction depends on a. b. 8. Friction is greater between: 9. Define Newton’s second law: 10. What is the formula associated with the second law? 11. What is gravity? 12. What will make gravity increase? 13. What is weight? 14. What is the acceleration of an object due to gravity? (give me a number) 15. How does air resistance change the acceleration of objects in a free fall? (why does a feather fall slower than an elephant if gravity is always the same?) 16. What factors affect air resistance? 17. What are real life examples of air resistance that are helpful in our everyday lives? 19. What is an example of non linear motion? 20. What is Newton’s third law of motion? 21. What are some examples of Newton’s Third law. 22. What is momentum. 23. Explain the law of conservation of momentum and give an example. 24. When you have an action - reaction pair explain what happens to make motion happen? 25. What would be the difference with larger masses and smaller masses?

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