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Lesson
Motion in a Straight Line — Complete Lesson
Kinematics — Motion in One Dimension
Key Definitions
- Distance — total path length (scalar, always positive)
- Displacement — shortest distance from initial to final position (vector)
- Speed = distance / time (scalar)
- Velocity = displacement / time (vector)
- Acceleration = change in velocity / time (vector)
Equations of Motion (Uniform Acceleration)
v = u + at
s = ut + ½at²
v² = u² + 2as
where u = initial velocity, v = final velocity, a = acceleration, t = time, s = displacement
Graphical Analysis
| Graph | Slope gives | Area under curve gives |
|---|---|---|
| x-t graph | Velocity | — |
| v-t graph | Acceleration | Displacement |
Free Fall: When an object falls freely under gravity, a = g = 9.8 m/s² (downward). Use the same equations with a = g!
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Motion in a Straight Line — MCQ Practice
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