Page 32 - Physics

Physics for Secondary Schools
this investigation?
6. You notice that a metal spoon left
in a hot cup of tea becomes warmer
to the touch, while a wooden spoon
in a similar cup does not show the
same change. Formulate a testable
hypothesis to investigate the
difference in heat transfer.
7. A group of students is studying the
relationship between the mass of
an object and the force required to
move it across different surfaces.
They change the mass of the object
and measure the applied force.
Identify the dependent, independent,
and controlled variables in this
investigation.
8. A group of students is conducting
an experiment to measure the
acceleration of a toy car on different
inclined planes. They release the
car from rest at the top of each
inclined plane and measure the
time it takes to reach the bottom.
They collected and recorded data
shown in Table 1.4.
Table 1.4
Inclination Time to reach
(in degrees) the bottom
(seconds)
10 1.2
20 0.9
30 0.6
40 0.4
50 0.3
26
Physics Form 1 Final.indd 26
What can the students conclude
about the relationship between the
inclination and the time taken by
the toy car to reach the bottom of
inclined plane?
Section C
Theories and principles
9. A science class is learning about the
properties of materials and observes
that some objects sink in water, while
others fl oat, even though they are
made of the same material. Suggest
and state the principle related to the
above scenario.
10. During an activity in class, each
student stretches a helical spring
and observes its behaviour upon
releasing.
(a) What behaviour did they
observe
(b) What principle of Physics does
the phenomenon obey?
11. A group of students are observing
a plastic bottle containing water.
They realize that when the bottle
is punctured and squeezed, water
squirts from all holes with the same
pressure. Suggest and state the
principle related to this observation.
Student’s Book Form One
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