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 Physics Paper 3, May/June 2014
 Questions: 1 2 3 Main
Weakness/Remedies
Strength

Question 1

(a)

You are provided with a retort stand, clamp and boss head, a pendulum bob, a piece of thread, a stop watch and other necessary materials.

(i)         Set up the apparatus as illustrated in the diagram above.
(ii)        Measure and record the distance h = 130 cm from the centre of the bob to the point of suspension of the pendulum.
(iii)       Displace the pendulum through a small angle and release.
Allow the pendulum to oscillate freely.
(iv)       Determine the time, t for 20 complete oscillations.
(v)        Also determine the period, T of the oscillations.
(vi)       Evaluate T2 and L = h – 30.
(vii)      Repeat the procedure for four other values of h = 110 cm, 90 cm, 70 cm and 50 cm respectively.
(ix)       Plot a graph with T2 on the vertical axis and L on the horizontal axis, starting both axes from the origin (0, 0)
(x)        Determine the slope, s, of the graph and intercept, e, on the vertical axis.
(xi)       Evaluate:

(α)        k1 =    4π2
s

(b)       k2 =                                         [Take π  = 3.14]

(xii)      State two precautions taken to obtain accurate results.

(b)(i)      What is meant by the period of oscillation of an oscillating body?

(ii)    Explain acceleration of free fall due to gravity.

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Observation

Part (a):  This was a popular question among the candidates and performance was average.  However, few candidates could not draw good graphs using their values.

Part (b):  The (i) was well attempted while in (ii) virtually all the candidates left out the key word falling under its own weight alone in the explanation.

Candidates are expected to:

1. Measure and record five values of h to at least 1 d.p. in cm.
2. Determine and record five values of time t to at least 1 d.p. in seconds and in trend.
3. Correctly evaluate and record to at least 2 d.p.
4. Correctly evaluate and record five values of T2 to at least 2 d.p.
5. Correctly evaluate five values of L = h – 30
6. Show composite table containing h, L, t, T and T2

-           Plot a graph using reasonable scales
-           draw line of best fit
-           determine the slope of the graph and the intercept c
-           evaluate k1 = k1 =  4π2/s and k2 =
-           state any two of the following precautions

e.g  -    Avoided conical oscillations
-    Ensured firm suspension of pendulum
-    Ensured reading is repeated (shown on the table)
-    Avoided draught
-    Corrected/noted for zero error of metre rule/ stop match/clock
-    Avoided parallax error in reading metre rule/ stop clock

(b)  (i)   The period of oscillation of a body is the time taken for the body to make one
complete to and from movement

(ii)   When a body is falling under its weight (alone), the rate of increase of its
velocity with time (as a result of the earth’s gravitational pull) is the acceleration
of free fall due to gravity.