# Speed, velocity & acceleration

- Created by: Phelps
- Created on: 18-12-13 17:06

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- Speed, velocity & acceleration
- Speed
- Scalar quantity (size only)
- v = Distance moved / Time taken
- SI unit = m/s

- Velocity
- Vector quantity (size and direction)

- Distance-Time Graph
- Gradient of graph increases with speed

- Speed-Time Graph
- Area under graph = distance travelled

- Acceleration
- a = change in velocity / Time
- SI unit = m/s2
- All objects near the earth fall with a constant acceleration = 10m/s
- Acceleration of free fall is NOT dependent on mass

- rate of change in velocity per unit time
- Acceleration is constant if a constant resultant force is acting
- a = v-u / t

- Acceleration is NOT constant if a varying resultant force is acting
- e.g. objects falling in air; car accelerating (air resistance increases with velocity)

- Motion of bodies falling in an uniform gravitational field
- In a Vacuum
- Velocity
- Acceleration

- With Air Resistance
- Velocity
- Acceleration

- In a Vacuum

- Speed

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