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SECONDARY EDUCATION CERTIFICATEEXAMINATION
Ilyhours
You MUST use this answer booklet when responding to the questions. For each question, write
your answer in the space provided and return the answer booklet at the end of the examination.
ALL WORKING MUST BE SHOWN in this booklet, since marks will beawarded for correct steps
in calculations.
Copyright @ 1998 Caribbean Examinations Council.
All rights reserved.
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Figure J ahove represents a cross section of a tahle knife being used to prise off the lid of
acan.
(hj The knife when llsed inthis manner acts as asimple machine. StMethe name ofthe simplemachine.
(c) On Figure 1, (i) indicate the position of the pivot, P, and (ii) draw an an-ow to show the
direction of the force, F, which the knife exerts on the lid. ( 2marks)
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(e) Calculate the magnitude of the force, F, which the knife exerts on the lid. (Ignore the mass
of the knife.)
The can exe,ts all upward force at point, T', 011the knife. What isthe value of this force just
before the lid moves?
(g) Htlle force, F, istoo small to lift the lid, suggest TWO changes you might make to increase
the value of F.
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A transverse wave Oil the surface of a liquid has a wavelength of 1.8cm. Explail1 wbat is
meant by a transverse wave ami the wOlJrlengrh of the wave.
(b) Figure 2 below is adisplacement-time graph representing the wave described in part (a)
above.
Displacement t
O.9
