1. Forces Glider Engineering Challenge

8. Newton’ s 1 st Newton’s 2 nd Fnet = ma Weight F g = m g Spring F s = -kx Newton’ s 3 rd FBDs Culm. Activity Forces Mystery Stations Carts & Masses Force Meters Tug-of- War Force Stations Glider Challenge * *

9. Mystery Stations  Qualitative  Students rotate around stations  Observe  Explain  Guess at what they all have in common  Newton’s 1 st Law–Inertia

10. Carts & Masses  Quantitative investigation  Design and execute an experiment to determine how the motion depends on applied force  Represent findings through a graph  Newton’s 2 nd Law  F net = m a

11. Force Meters  Introduce force due to gravity  Create home-made force meter  F grav = m g  F spring = -k x

12. Tug-of-War  Quantitative  Use force meters to investigate action-reaction  Newton’s 3 rd Law  F a,b = –F b,a a. b. c. d.

13. Force Stations  Qualitative  Quantitative  Students rotate around stations  “Draw the forces”  Free-Body Diagrams

14. The Glider Engineering Challenge  Design and build a working glider  Conduct an experiment to optimize the design  Design Report I  Analysis & FBDs  Launch Competition  Design Report II  Analysis of Launch & Reflection

15. The Glider Engineering Challenge  Build a working glider  Must slide freely in track  Must have notch at nose for string attachment  Conduct an experiment to optimize one aspect of the design  Launch Competition m = 5.70 kg