Page 63 - Physics

Measurement
(b) Figure 2.44 shows a measuring
cylinder containing water
before and after a stone is
immersed. What is the volume
of the stone?
String
Measuring
Cylinder
Water
Stone
Figure 2.44
5. Figure 2.45 shows a metre rule
being used to measure the length
of a textbook.
Figure 2.45
(a) What is the approximate length
of the book?
(b) Explain why it is advised to start
at the mark beyond 0 cm when
taking a measurement using a
metre rule.
6. A physics student obtained the
following results for the diametre of
Physics Form 1 Final.indd 57
the same wire from an experiment:
0.35 mm, 0.36 mm and 0.34 mm.
Calculate the diametre of the wire.
7. A rectangular block measures height
1.00 cm, width 2.50 cm, and length
4.00 cm.
(a) What instrument was used
to measure the sides of the
rectangular block?
(b) Calculate the volume of the
rectangular block.
8. A student repeatedly measures the
mass of an object as 49 grams,
while the actual mass is 52 grams.
What conclusions can be drawn
about the accuracy of the student’s
measurements?
9. When a car was fi rst seen, the
stopwatch start button was pressed.
When the car passed the observer,
the stopwatch showed 01: 02. How
long did the car take to reach the
observer?
10. An athlete runs round a track three
times. Her friend uses a stopwatch to
record the time elapsed. At the start
of the ride, the stopwatch recorded
6.00 s, after one round the stopwatch
recorded 180.00 s and at the end
of third round the reading from the
stopwatch was 600.00 s. What is the
average time for one round of the
track?
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