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Physics for Secondary Schools
is not easy. For example, if it is pressed
hard on a table surface, all the air between
it and the table can be squeezed out,
hence creating a vacuum. In that case, the
plunger will stick to the table because of
the higher atmospheric pressure outside.
Figure 7.33: The vacuum cleaner
Plunger
A plunger shown in Figure 7.34, is a cup-
like rubber sucker, with a long handle at
one end. When used correctly, a plunger
can unclog pipes and make them operate
smoothly. Sometimes pulling the plunger Figure 7.34: Plunger
Lift pump
A lift pump is used to raise water from underground sources. This is a pump that is used
to lift the liquid, rather than force liquid up. This pump is illustrated in Figure 7.35.
Down Up
H H H
A A A
B B Atmospheric B
pressure
Water
level
Figure 7.35: Lift pump
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Student’s Book Form One
Physics Form 1 Final.indd 158 16/10/2024 20:57
