Interpreting the Graph

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Presentation transcript:

Interpreting the Graph

Distance/Time Graphs A distance/time graph shows how far an object travels over a certain time. Always pay attention to the titles on the X axis and the Y axis on a graph. Lines have different meanings depending on the axis labels. A straight, horizontal line (flat line) indicates an object at rest. A straight, diagonal line indicates an object traveling at a constant speed. A line curving upward indicates an increase in speed (acceleration). A line curving downward indicates a decrease in speed (acceleration)

Interpret the Graph Below: The graph depicts an object which is at rest. The distance does not change as time goes on. Distance (m) Time (sec)

Interpret the Graph Below: Distance (m) Time (sec) The graph depicts an object moving at a constant speed. The straight line shows that the speed stays the same over time. It is not accelerating.

Interpret the Graph Below: Distance (m) Time (sec) Just like the previous graph, this graph depicts an object moving at a constant speed. It is not slowing down.

Interpret the Graph Below: Distance (m) Time (sec) The curve, in the graph, depicts that the object’s speed is changing as time passes. This is acceleration due to speeding up. The object is covering more distance in shorter time. Ask students to predict what the graph would look like if the object is accelerating due to slowing down (covering less distance over time). Ask them to agree or disagree that this would be acceleration and to justify their answser.

Interpret the Graph Below: In the first part of the graph, the object is moving with constant speed. In the second part of the graph, the object is at rest (not moving). It accelerated because it stopped. In the third part, the object is again moving with constant speed while returning to its point of origin. It changed direction, therefore it has velocity and it accelerated. Distance (m) Time (sec)

Velocity (speed)/Time Graphs A velocity (speed)/time graph shows the acceleration of an object. In other words, it shows the change in velocity over time. Always pay attention to the titles on the X axis and the Y axis on a graph. Lines have different meanings depending on the axis labels. Velocity includes a speed and a direction. Acceleration may be an increase in speed, a decrease in speed, coming to a stop, or changing direction.

Interpret the Graph Below: The graph depicts an object with a constant velocity. The speed and direction stay the same over time Velocity (speed) m/s Time (sec)

Interpret the Graph Below: The graph depicts an object with constant positive acceleration. The velocity is increasing at a constant rate of speed. Velocity (speed) m/s Time (sec)

Interpret the Graph Below: The graph depicts an object with constant negative acceleration. The velocity is decreasing at a constant rate of speed. Velocity (speed) m/s Time (sec)

Interpret the Graph Below: Velocity (speed) m/s Time (sec) The graph depicts an object with increasing acceleration. The velocity is increasing. Ask students to predict how the line would look if the object had decreasing acceleration.