Ch 5 Study Guide

Spencer Lee B 3/12/07 Ch 5 study Guide 1. What is speed? What formula do you use to calculate speed? 1. Speed is the rate at which an object moves. Speed = distance/ time 2. What is the SI Unit for speed? 2. meters/ second 3. If you travel 50 m in 5 secs. What is your avg. speed? 3. average speed= 10 m/s 4. What is the difference between speed and velocity? 4. Velocity has direction 5. What is acceleration? How do you calculate it? 5. Rate at which velocity changes. Starting velocity-Final velocity 9. Force push or pull- Newtons 10. How do you calculate net force on an object? 10. When forces are in same direction add them together. 12. When does an object have a change in motion? 12. Change when unbalanced. 13. An balanced force is at 0 14. What is friction? 14. Opposes two objects that are touching. 16. What can u do to decrease friction? 16. You can use lubricants or switch to rolling friction. 17. Make surfaces rougher or pushing them together.