Mrs. Smith was our sub today and we went through the instructions for the rest of the class. We were to work on the Motion of Cars Investigation assignment that we had started the day before.
The previous day we had already collected all the data, so we were to analyze it and construct Position-Time graphs for the pull back car and battery operated car.
The information that we collected yesterday was the time inbetween every 6 dot intervals (which was always 0.10 seconds), the displacement between every set of dot intervals, and the displacement between each set of dot intervals in relation to the starting point (0).
By analyzing these graphs, we could see if the cars were moving in uniform motion (moving in a constant direction and speed), or non-uniform motion (changing in direction or speed).
For example:
In this Distance-Time graph, one can see that the object is moving in uniform motion, because it is moving with a constant velocity in a constant direction.
In this Velocity-Time graph, one can see that the object is moving in non-uniform motion because it is not moving at a constant velocity.
The above graphs show how important it is to know the difference between Distance-Time graphs and Velocity-Time graphs. Although they may look the same, they could give you completely different answers.
This assignment and the graphs that we had to complete relates to what we have been learning about recently. For the past few days, we have been learning to analyze and construct Distance-Time graphs and Velocity-Time graphs. In the assignment we also have to do a quick sketch of an Acceleration-Time graph for the pull back car, and recently we have been learning about acceleration.
~Rebecca is next
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