Term 1 Week 3 · Two Forces, Two Objects · CG Quarter 1, competencies 4–5
| # | The misconception | Where it shows | What to do |
|---|---|---|---|
| 1 | The two forces cancel, so nothing should move | §B, exit ticket 1 | They are on different objects. Forces only add up when they act on the same thing. This is the whole lesson |
| 2 | The heavier or stronger object pushes harder | §C3, exit ticket 2 | The chairs, run with an obvious mass difference. The forces are equal; the accelerations are not |
| 3 | A book's weight and the table's push are an action–reaction pair | §C4, worksheet ★ | Both act on the book. Name the object for each force and the answer appears without argument |
| 4 | The action happens first and the reaction follows | §D vocabulary, throughout | They begin and end together. It is the English word reaction causing it, so name the word as the culprit |
| 5 | A stationary object like a table cannot exert a force | §C4 | It exerts exactly enough to hold the book up, and it stops doing so if the book is too heavy — which is what breaking a table means |
| 6 | The tug-of-war winner pulls harder on the rope | §D | The rope forces are equal. Friction with the ground decides it, which is why shoes and weight matter and arms matter less |
| 7 | The reaction is smaller if the other object is soft | Game Round 1 | Punching a pillow hurts less because the force is spread over more time and area, not because it is smaller. The pair is always equal |