Form 2 Track 2 Physics Worksheet - Annual Examinations For Secondary Schools, 2012 Page 5
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115.a.
Two children play on a seesaw 5.0 m long. They sit at 2.5 m from the pivot at each end of
the seesaw as shown below.
Diagram 3
John
Carmen
35 kg
45 kg
i.
Calculate the moment produced by John about the pivot.
________________________________________________________________________________
(1)
ii.
Calculate the moment produced by Carmen about the pivot.
________________________________________________________________________________
(1)
iii.
The seesaw is not balanced. Explain why.
________________________________________________________________________________
(1)
iv.
Another boy, Frank of mass 25 kg, sits on the seesaw to balance it. Calculate the
distance from the pivot where Frank should sit to balance the seesaw.
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(3)
b.
A physiotherapist suggests arm exercises to a patient to strengthen her arm muscles.
Diagram 4 shows the bones and one muscle of her arm.
i.
Calculate the moment in Ncm of the 9 N
weight about the elbow.
_______________________________________________
____________________________________________ (1)
ii.
Suggest why the muscle must contract with a
force greater than 9 N to stop the arm from
moving down.
_______________________________________________
____________________________________________ (1)
Physics – Form 3 Secondary – Track 2 – 2012
Page 5 of 11
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