# P2. Topic 1- Motion

This is the whole of Topic 1 on P2

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• Created by: Teresaxox
• Created on: 04-05-16 20:51

## 1.1 Distance-Time graphs

• Gradient of the line on a distance-time graph represents an object's SPEED.
• The STEEPER the line the GREATER the speed it represents
• Equation: Speed in metres per second, m/s =

distance travelled in metres,m (divide)                                                       time taken in seconds,s

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## 1.2 Velocity and Acceleration

• VELOCITY is SPEED in a given DIRECTION.
• If and object changes direction it also changes Velocity even if the speed is still the same.
• If the Velocity changes then we say that it ACCELERATES.
• ACCELERATION is the change of velocity per second.
• DECELERATION is the same as negative acceleration
• Equation: a =  v - u
•                        t
• Symbols and meanings:
• a is acceleration in metres per second,m/s²
• v is the final velocity (The velocity we have at the end) in metres per second, m/s
• u is the initial velocity (starting velocity) in metres per second, m/s
• t is the time taken for the change (Make sure to convert from hours to seconds) in seconds,s
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## 1.3 More about Velocity-Time Graphs

• If the line on a velocty-time graph is HORIZONTAL, the acceleration is ZERO therefore the object is travelling at a steady speed.
• The area under the velocity-time graph is the DISTANCE travelled.(HIGHER)
• If the gradient of the line is NEGATIVE the object is decelerating.
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## 1.4 Using Graphs (HIGHER)

• The SPEED of an object is given by the GRADIENT of the line on its DISTANCE-TIME graph

• The ACCELERATION of an object is given by the GRADIENT of the line on its VELOCITY-TIME graph.

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