1. FBD Practice

2. 1. Book at rest on table FNFN FgFg ΣF y = ma y F N – F g = 0

3. 2. Girl holding rope T FgFg ΣF y = ma y T – F g = 0

4. 3. Free Falling Egg FgFg ΣF y = ma y – F g = ma y

5. 4. Book accelerating to right FNFN FgFg FAFA f ΣF y = ma y F N – F g = 0 ΣF x = ma x F A – f = ma x

6. 5. Book across desk at constant v FNFN FgFg FAFA f ΣF y = ma y F N – F g = 0 ΣF x = ma x F A – f = ma x F A – f = 0

7. 6. Sled with acceleration left FNFN FgFg f FAFA ΣF y = ma y F N – F g = 0 ΣF x = ma x f - F A = ma x

8. 7. Football near peak of flight FgFg ΣF y = ma y – F g = ma y

9. 8. Car coasting right but slowing down FNFN FgFg f ΣF y = ma y F N – F g = 0 ΣF x = ma x – f = ma x

10. 9. Shopping cart with 40° push down and to right moving at constant speed FNFN FgFg FAFA f 40 ° ΣF y = ma y F N – F g – F A sin40 = 0 ΣF x = ma x F A cos40 – f = ma x F A cos40 – f = 0

11. 10. Sled accelerated left by pull at 30° above horizontal FNFN FgFg FAFA 30 ° ΣF y = ma y F N – F g + F A sin30 = 0 ΣF x = ma x -F A cos30 = ma x

12. Try it… 1. A shuffleboard puck slowing to a stop as it slides across the court 2. A crate pulled at a constant speed to the left by a rope that makes a 25 degree angle with the horizontal