# Physics chapter 9

- Created by: Gracieeeeee
- Created on: 29-01-18 17:20

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- P9: Motion
- P9.1:Speed and Distance-time graphs
- Speed= distance travelled/ time taken
- speed is measured in m/s

- The gradient of a line on a distance-time graph represents speed
- Speed= distance travelled/ time taken
- speed is measured in m/s

- Speed= distance travelled/ time taken

- Speed= distance travelled/ time taken
- P9.2 velocity and acceleration
- velocity is a speed in a given direction
- the acceleration of an object is its change of velocity per second
- deceleration is the change of an objects velocity when it slows
- acceleration= change in velocity/time taken for change

- a vector is a physical quantity that has direction AND magnitude
- a scalar is a physical quantity that only has magnitude

- displacement is distance travelled in a given direction

- P9.4: analysing motion graphs
- gradient =y/x
- find the speed at any point by drawing a tangent
- the tangent is a straight line that touches the curve without cutting through
- the speed at any instant in time of an object moving at changing speed is given by the gradient of the tangent to the line

- the tangent is a straight line that touches the curve without cutting through
- the speed at any instant in time of an object moving at changing speed is given by the gradient of the tangent to the line

- P9.1:Speed and Distance-time graphs

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