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

  • 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 GRADIENT represents acceleration.
  • 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

   time (s) on x axis, distance (m) on y axis (http://www.bbc.co.uk/staticarchive/4290b412e1210381d2a5f21b2fbd4a08259a4e59.gif)

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

time (s) on x axis, velocity (m/s) on y axis (http://www.bbc.co.uk/staticarchive/9f257a2dff36a8b5eb6c77d7ce587c04f7ffd6ed.gif)

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