Science Class 9
Describing Motion Around Us
Describe motion with position, distance, displacement, speed, velocity and graphs.
11 lessons · ~77 min total
Track progress — 0 of 11 lessons read 0%
Lessons in this topic
- 0 Start here A roadmap: position, distance, speed, acceleration, graphs and motion round a circle. · 4 min You are here
- 1 Where it is A position is a distance and a direction from a reference point you choose. · 6 min
- 2 Distance and displacement Distance is the whole path length. Displacement is the change in position, with a direction. · 7 min
- 3 Average speed and velocity Average speed uses distance. Average velocity uses displacement. Both divide by time. · 8 min
- 4 Acceleration Acceleration is how fast the velocity changes. It slows an object when it points against the velocity. · 8 min
- 5 Steady and changing motion Equal distances in every equal time, however short, mean uniform motion. Otherwise it is non-uniform. · 7 min
- 6 Reading a graph The slope of a position-time graph is velocity. The slope of a velocity-time graph is acceleration. · 8 min
- 7 Area under the line The area under a velocity-time line is the displacement, and three equations use it. · 9 min
- 8 Round and round Steady speed on a circle still means acceleration, because the direction keeps changing. · 8 min
- 9 The big picture Eight ideas about describing motion on one screen, with the hand-off to your book. · 4 min
- 10 Track quiz Eight rules, then ten questions. · 8 min
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