Wheel & axle lab: Changing speed / velocity. Weekend HMWK: see below.
Today groups represented motion of the wheel and axle different ways, mostly:
*motion maps (showed increasing distance between points)
*distance/time graphs showing cm on the y-axis and seconds on the x-axis (graphs should have curved upward, showing a changing slope (slope = speed or velocity in this case)
*torn-tape distance/time graphs showing a similar upward curve
*speed or velocity/time graphs showing the change in position per second on the y-axis. Most of these had a line of best fit showing a gradual, but steady, increase in speed.
*torn-tape graphs with pieces side to side showed mostly the same trend
*data tables representing the distance at succeeding intervals of time, which were used to find instantaneous speed at the beginning and end of the activity as well as an average over the whole event.
HMWK: work to answer #1-7 of the graph questions on the back of last night's practice sheet. #1&5 are asking for labels such as "time" to go on the axes of the graphs. (both x axes are time, but the y axes should be different - see the units)
Units for #2 and #6 are different - see y axis units again
#7 is tough; recall what you chose as the y-axis label and this should make things go smoothly.
Next week we will discuss this idea of changing velocities, name it, and work lots of math and graphs around it; the concept is crucial for our first real Science topics next unit; Forces
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