บทเรียน
เปิดบทเรียนใดก็ได้ตอนนี้ ตามลำดับใดก็ได้ แผนการเรียนแนะนำหนึ่งบท แต่ไม่ได้ล็อกบทอื่น
- 1 Pushes and pulls between two things
- 2 Balanced and unbalanced forces
- 3 Friction between two surfaces
- 4 Speed as distance over time
- 5 Reading a distance-time graph
- 6 Drawing a distance-time graph
- 7 One store down, another up
- 8 Following a chain of transfers
- 9 Nothing is lost, it spreads out
- 10 Sound needs something to travel through
- 11 Light travels in straight lines
- 12 Shadows are geometry
- 13 Repeated readings and a best estimate
- 14 Why two readings differ
- 15 Gravity pulls everything down
- 16 Mass stays the same, whatever the change
- 17 Matter is made of particles too small to see