Page 152 - Physics - XI

Graph

Plot a graph between load and depression by taking load Y
on X-axis and depression on Y-axis for both of the cases,
i.e., metre rod is loaded at its end and in the middle. In both
the cases, graphs come to be a straight line as shown in the
Fig. 6.2.

Result Depression δ (in cm) Scale used on:
X-axis, 1 cm = .... g wt
The graph between load and depression in both the cases, Y-axis, 1 cm = .... cm
i.e. when metre rod is loaded (i) at its end (ii) in the middle
are straight lines which shows that depression is directly X
proportional to the load. Load (in g wt)
Fig. 6.2: Graph between load and depression
Precautions
1. The metre rod should be clamped fi rmly with table top.

2. When no load is suspended, the metre rod should remain horizontal.
3. The tip of the pointer should not touch the vertical scale.

4. The rod should not be loaded beyond the elastic limit.

ACTIVITY - 7
Aim

To observe the decrease in pressure with increase in velocity of a fl uid.

Apparatus and Materials Required

A venturimeter with two vertical tubes, Vernier Calliper, tap water, metre scale, and spirit level

Description of Apparatus
The one end of a wide tube (pipe) is connected to the narrow tube (pipe) tightly so that the water does not

leak. The free end of the wide pipe is connected to the tap water. The pipes are placed horizontally on the
table in such a way that both the vertical tubes (capillaries) remain vertical in a horizontal line as shown
in Fig. 7.1.

P 2
P 1 C

h 1 D h
2
A a 1 B a 2

Fig. 7.1: A venturimeter
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