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Warm up

motion. Warm up. Write the word motion vertically in your notebook and following each letter, write something that describes motion. Graphing Motion. Motion: an act, process, or instance of changing position through time

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Warm up

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  1. motion Warm up Write the word motion vertically in your notebook and following each letter, write something that describes motion

  2. Graphing Motion Motion: an act, process, or instance of changing position through time -Describing the motion of an object is occasionally hard to do with words. Sometimes graphs help make motion easier to picture, and therefore understand.

  3. Distance – Time Graphs - Plotting distance against time can tell you a lot about motion. Let's look at the axes: Time is always plotted on the X-axis (bottom of the graph). The further to the right on the axis, the longer the time from the start. Distance is plotted on the Y-axis (side of the graph). The higher up the graph, the further from the start.

  4. No motion – At rest • If an object is not moving, a horizontal line is shown on a distance-time graph. Time is increasing to the right, but its distance does not change. It is not moving. We say it is At Rest.

  5. Constant Motion • If an object is moving at a constant motion or speed, it means it has the same increase in distance in a given time Time is increasing to the right, and distance is increasing constantly with time. The object moves at a constant speed. Constant speed is shown by straight lines on a graph.

  6. Constant Speed • This graph shows constant motion because the slope of the line does not change. • The slope of the line can be used to determine the speed of the object. • The change in distance for every minute on this graph is constant. • Speed = distance time • In this graph Speed = 2 m/min.

  7. Slope and Speed are Related Let’s look at two moving objects: Both of the lines in the graph show that each object moved the same distance, but the steeper dashed line got there before the other one • A steeper line indicates a larger distance moved in a given time. In other words, higher speed. • Both lines are straight, so both speeds are constant.

  8. Change in Direction • On a motion graph, you can tell when the object reverses direction because the distance from the starting point becomes less. • By looking at the slopes of the two lines, what can be said about the speed before compared to the speed after turning around? • The speed before turning around is quicker because the _______ is greater than after turning around.

  9. Analyze Motion Speed and Direction

  10. Graphing Motion Summary A distance-time graph tells us how far an object has moved with time. • The steeper the graph, the faster the motion. (slope = speed) • A horizontal line means the object is not changing its position - it is not moving, it is at rest. • A downward sloping line means the object is returning to the start.

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