AQA additional physics - Motion

AQA board additional physics

Motion

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DISTANCE TIME GRAPHS

A distance time graph is used to show the distance os a body from a starting point against time taken.

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/ph_forces01.gif)

The slope represents speed, the greater the slope the greater the speed.

The speed of a body is the distance travelled each second. We can calculate this by the equation:

Speed (m/s) = distance travelled / time taken.  

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VELOCITY AND ACCELERATION / VELOCITY TIME GRAPHS

The velocity of a body is its speed in a given direction. If the body changes direction it changes velocity, even if the speed stays the same.

If the velocity of a body changes we say it accelerates.

Acceleration(m/s 2) = change in velocity / time taken for the change.(http://www.bbc.co.uk/schools/gcsebitesize/science/images/ph_forces02.gif)

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VELOCITY TIME GRAPHS CONTINUED...

  • The slope of a line on a velocity time graph represents acceleration
  • The steeper the slope, the greater the acceleration
  • If the slope is negative, the body is decelerating
  • The area under the line on a velocity time graph represents the distance travelled in a given time  
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