SME
Grade 8 Science · Problem type
Steady, speeding up or slowing down?
Use this for “A toy car’s position is marked each second. Is it moving steadily, speeding up or slowing down?”
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From the positions each second, how is it moving?
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Assumptions
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Speed is the gap between positions one second apart.
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20, 15, 10, 5, 0 is a steady speed toward the start: equal gaps, negative velocity.
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Related lessons
Speed, velocity and acceleration
Main lesson
A walk on a position-time graph
Use this for “On a position-time graph, when is the walker standing still, moving fastest, or heading back to the start?”
Speeding up: a speed-time graph
Use this for “A cart speeds up from 2 m/s at 1.5 m/s² for 4 s. How fast is it going, and how far did it go?”