# Physics: Explaining Motions

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- Created by: sumaiya.99
- Created on: 14-09-15 19:18

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- P4: Explaining Motions
- Speed:
- Speed (m/s) = Distance (m) /Time (s)
- Instantaneous Speed: is a particular speed in one moment in time.
- Speed-Time Graphs:
- A visual way of showing how an objects speed changes over a period of time.
- The steeper line, the greater the size of the accelaration.
- A horizontal line means that the speed of the object is at a constant speed.
- A straight line going up shows accelaration.
- A straight line going down shows decelaration.

- Velocity:
- The speed of an object in a certain direction.

- Gradient:
- The degree of slope of a line.
- The gradient of a speed time graph is accelaration.

- Distance-Time Graphs
- A visual way of showing the time taken for a journey, and the distance travelled.
- The steeper the gradient of the line, the faster the speed.
- A horizontal line suggests that the vehicle is stationary.
- A straighter diagonal line means that the vehicle is travelling at a constant speed.

- The gradient of the line is equal to the speed.

- Speed:
- How far an object travels, using the equation:
- Accelaration = Changeof velocity (metres per second)/ time for the change

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