Page 668 - SUBSEC October 2017_Neat

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Answer ALL questions.

Write your answers in the spaces provided in this booklet.

1. (a) In this experiment, you will investigate the relationship between the period of oscillation
of a cantilever and the mass attached at its end; and use this relationship to determine the
Young modulus of wood. DO NOT WRITE IN THIS AREA

You are provided with the following pieces of apparatus:

• G clamp
• A metre ruler
• Six 100-g slotted masses
• Stopwatch
• Pencil or biro
• Thick rubber band
• Vernier caliper

M
L DO NOT WRITE IN THIS AREA

Figure 1. Diagram of set-up of apparatus

Procedure:

1. Using your Vernier caliper, measure and record the values for the width, W, and
thickness, t, of the metre ruler.
2. Set up the apparatus as shown in Figure 1 with one end securely clamped to the bench.
Ensure that the length, L, of the metre ruler is set to 90 cm.
3. Using your rubber band, secure a 100-g mass to the end of the ruler. Ensure that the
masses line up exactly with the end of the ruler.
4. Displace the ruler slightly and record the time for 15 oscillations. Repeat this step to
find an average value. DO NOT WRITE IN THIS AREA
5. Add another 100-g mass to the end of the ruler. Secure with a rubber band and record
the time for 15 oscillations.
6. Repeat steps 4 and 5 until you have completed the oscillations with 600 g on the end of
the ruler.
7. Record your measurements in Table 1.
8. Determine the values of the period, T, lg m and lg T and record these values in Table 1.

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