The PMQ probes - University of Cape Town

Physics measurement questionnaire
Number:
Q 1.
(RD)
The students work in groups on the experiment. Their first task is to determine d when
h = 400 mm. One group releases the ball down the slope at a height h = 400 mm and,
using a metre stick, they measure d to be 436 mm.
The following discussion then takes place between the students.
I think we should
roll the ball a few
more times from
the same height and
measure d each
time.
Why? We’ve got
the result already.
We do not need
to do any more
rolling.
I think we
should roll the
ball down the
slope just one
more time
from the
same height.
A B C
With whom do you most closely agree? (Circle ONE):
A
B
C
Explain your choice.
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Physics Education Research Group, University of Cape Town, South Africa
and Science Education Group, University of York, UK