2 Kinematics - BC Science Physics 11

4. Carefully measure the distance the cart travelled during each successive 0.10 s time interval. For example, in the
sample tape in Figure 2.3.4, the distance travelled during the interval between 0 and 0.10 s was 1.1 cm.
Figure 2.3.5 shows how to measure the distance travelled during the second 0.10 s interval between 0.10 s and
0.20 s. In the sample tape, the distance is 1.8 cm. Prepare a table like Table 2.3.1. Record the distances travelled
in each of the recorded intervals in your table.
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Figure 2.3.5 How to measure the distance between 0.10 s and 0.20 s
Table 2.3.1 Data for an Accelerating Cart
Time Interval
(s)
0 to 0.10
0.10 to 0.20
0.20 to 0.30
0.30 to 0.40
0.40 to 0.50
0.50 to 0.60
Distance Travelled
(cm)
Average Speed for the
Interval (cm/s)
5. Your next task is to figure out the average speed of the cart during each of the 0.10 s time intervals. Since
average speed is just the distance travelled during the time interval divided by the time interval, all you have
to do is divide each measured distance by the time interval (0.10 s). During the first time interval on the sample
tape, the cart moved a distance of 1.1 cm. The average speed of the cart during the first 0.10 s was therefore
v – =
1.1 cm
0.10 s
= 11 cm/s
During the second time interval (between 0.10 s and 0.20 s), the cart moved a distance of 1.8 cm. Its average
speed during the second interval was therefore
v – 1.8 cm
= = 18 cm/s
0.10 s
6. Using your own tape data, calculate the average speed of the cart during each of the time intervals and
complete Table 2.3.1.
60 Chapter 2 Kinematics © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6