The concepts and item parameters (Cronbach' Alpha).
| Group | Concept | Items Number | Difficulty Index | Discrim-ination Index | Point-Biserial |
|---|---|---|---|---|---|
| 1 | Direction of action- reaction force | 1 | 0.19 | 0.53 | 0,60 |
| 4 | 0.26 | 0.63 | 0.60 | ||
| 9 | 0.55 | 0.74 | 0.45 | ||
| 2 | Magnitude of action-reaction force | 2 | 0.21 | 0.53 | 0.64 |
| 5 | 0.16 | 0.56 | 0.73 | ||
| 7 | 0.15 | 0.37 | 0.52 | ||
| 3 | Force of object on rest | 3 | 0.12 | 0.32 | 0.42 |
| 6 | 0.11 | 0.32 | 0.47 | ||
| 8 | 0.17 | 0.41 | 0.46 |