# Movement and Position (Forces and Motion)

- Created by: Lucy S
- Created on: 01-04-13 16:12

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- Movement and Position
- Speed
- Average speed = distance travelled / time taken.
- Units of speed : metres per second (m/s), kilometres per hour (km/h)

- Vector and Scalar Quantities
- Scalar quantities do not take direction into account.
- Speed
- Distance

- Vector quantities take both size and direction into account.
- Displacement
- Velocity
- Acceleration

- Scalar quantities do not take direction into account.
- Distance-Time Graphs
- Gradient shows speed.
- Straight line shows a constant speed.
- A line curving upwards shows acceleration.

- Velocity-Time Graphs
- Gradient shows acceleration.
- Straight line shows a constant acceleration.
- Area under the graph shows distance travelled.

- Acceleration
- Acceleration = change in velocity / time taken.
- Units of acceleration: metres per second squared (m/s²)

- Speed

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