# Physics- Movement and Position

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• Movement & Position
• V= D/T
• V= velocity or speed
• D= distance travelled
• T= Time taken
• The distance travelled is measured in metres and time taken in seconds
• This means speed is measured in METRES PER SECOND (m/s)
• The speed equation can also be rearranged to give two other useful equations.
• Distance Travelled=     D= V X T
• Time Taken =     T= D/V
• Distance time graphs tell us how the car is travelling depending on its slope
• if it is sloping up to the right this shows a constant or a steady speed
• If the graph is sloping down to the right this is called a NEGATIVE GRADIENT
• Acceleration
• Equation
• Acceleration= Change in velocity/Time taken
• or                   final velocity - initial velocity/ time taken.
• a= (v-u)/t
• Velocity
• Speed in a particular direction
• For example if a car is travelling at 50 km/h around a bend its speed is constant but its velocity will be changing as long as that the direction that the car is travelling in is changing
• Deceleration
• means slowing down
• this means the decelerating object will have a smaller final velocity than its starting velocity
• E.G if you used the equation for finding the acceleration of an object that is slowing down the answer will have a negative sign.
• a negative sign simply means deceleration