← 4.2 Linear motion with constant acceleration
Velocity and relative speed
General Science · Grade 10 · about 40 minutes
Velocity is speed in a stated direction; two vehicles meeting or overtaking need a relative speed, and a constant-speed turn is still a changing velocity.
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- 7 sections of explanation, worked examples and diagrams
- 1 practice task with hints and worked answers
- A quiz that marks itself as you go
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Other lessons in this sub-strand
- Describing motion, and the four equations
- Free fall and the acceleration due to gravity
- Distance and displacement on real journeys
- Speed, units and average speed
- Velocity and relative speed
- Acceleration, second by second
- Using v = u + at
- Using s = ut + ½at²
- Using v² = u² + 2as
- Using s = ((u + v)/2) × t
- Distance–time graphs
- Velocity–time graphs: gradient and area
- Measuring acceleration on a ramp
- Constant acceleration around us
- Upward throws and the symmetric fall
- Stopping distances, falls and staying alive