Page 141 - Physics

Mechanical properties of matter

6. (a) What will happen when a that the rubber band stretches much
narrow glass tube is dipped into more than the spring. Why does this
mercury? happen, and what does it tell us about
(b) What is meant by the term the concept of elasticity in physics?
meniscus? Name the kind of 12. When a 150 g object is hung from the
meniscus formed in a glass scale the pointer moves down a distance
container: of 3 cm as shown in Figure 6.19.
(i) case of water
(ii) case of mercury

7. Describe how you would verify
Hooke’s law of elasticity. Which
precautions do you take in verifying
the law?
8. Imagine you have two glass capillary 3 cm
tubes, one with a narrower diametre
and the other wider. Dip both tubes
in water and you will notice that the
water level in the narrower tube rises
higher than the wider one. What can
you conclude from this observation?
9. A force of 9.6 N stretches a spring by 6
cm while a force of 14.4 N stretches it 150 g
by 9 cm. What force would be required
to stretch the spring by 15 cm?
10. A group of Form One students Figure 6.19
is conducting an experiment to The object is then placed on a table
investigate capillary action. They and reattached to the spring balance
place a small glass tube into a as shown in Figure 6.20.
container of water and observe the
water level inside the tube. They 1.2 cm
then add a small amount of detergent
to the water in the container and
observe the water level inside the
tube again. What effect, if any, will Figure 6.20
the detergent have on the water level
inside the tube? The scale is then pulled to the right
11. When both a rubber band and a and at the moment the object begins
to move, the pointer is found to have
metal spring are stretched using moved 1.2 cm to the left. What is the
the same force, it will be noticed
force between the object and the table?

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