A.1 · 4 · Opening of A.1 Kinematics · uniform motion (before A.1.1)
Model 1D motion: Y = vt
Turn "changing position with time" into a model, then animate it.
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Hook
If you know how fast something moves, can you say exactly where it will be later?
Uniform motion
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An object moves uniformly at v = 4 m s⁻¹ from Y = 0. Where is it after 5 s?
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Uniform motion means…
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In uniform motion the acceleration is…
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A drone climbs at a steady 5 m s⁻¹ from the ground. Write its height model, find the height after 8 s, and state your assumption.
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Remember earlier lessons
From lesson A.1 · 3
A convergent series adds up to…
From lesson A.1 · 2
The period of a pendulum is measured in…
Summary card
Key points
- • Uniform motion: equal change in position per unit time.
- • Velocity is the rate of change of position.
- • Y = vt predicts position, starting from Y = 0.
Formulas
- Y = vt
Key terms
- Velocity :
- rate of change of position
- Uniform motion :
- constant velocity, no acceleration
Common errors
- • Forgetting the start-at-zero assumption.
- • Leaving out the unit.
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