VERIFICATION OF ELASTIC MATERIALS
APPARATUS USED
•
•
•
•
Meter rule.
Spiral spring.
Scale pan.
Slotted weight of 50g, 100g, 150g, 200g,
250g, 300g.
• Pointer.
• Retort stand.
DIAGRAMS
1cm
Meter
ruler
Retort
stand
Spiral
Spring
Retort
stand
pointer
100cm
Bench
Scale
pan
50g 100g
Bench
200g
350g
PROCEDURES
1. From the arranged apparatus as shown
in the diagram record the length (Lo).
2. Put the slotted weight of 50g in scale pan
and record the new length (L)
3. Repeat the procedure no.2 for the
weights of 100g,150g,200g,250g,and
300g.
TABLE OF VALUES
Mass(g)
50
100
150
200
250
300
Length(L)
Extension(cm)
(L-Lo)
Questions
1.
2.
3.
4.
5.
What is the aim of this experiment?
Complete the table of results below.
Draw the graph of mass against extension.
Calculate the slope from the graph.
State the relationship between mass and
extension. State Hooke’s Law .
6. State the sources of errors and precautions
in this experiment.
DURING THE EXPERIMENT
50g
60g
pointer
61g
62g
Spiral
Spring
Meter
ruler
Retort
stand
63g
Retort
stand
64g
65g
66g
67g
100g
150g 200g 250g 300g 350g
Bench
Bench
DURING THE EXPERIMENT
60g
pointer
61g
62g
Spiral
Spring
Meter
ruler
Retort
stand
63g
Retort
stand
64g
65g
66g
67g
100g
150g 200g 250g 300g 350g
Bench
Bench
60CM
pointer
61CM
62CM
Spiral
Spring
Meter
ruler
63CM
Retort
stand
Retort
stand
64CM
65CM
66CM
67CM
100g 150g
200g 250g
Bench
Bench
300g 350g
AIM;-To find the relationship between mass and
extension of a material
Table values
Mass, m (g)
50
150 200 250
300
350
Pointer
reading, (cm)
62.6 64. 65.0
0
66.3
67.5
Extension
e=(S-So) cm
1.6
5.3
6.5
The original length Lo= 61cm
3.0 4.0
A graph of mass (gm) against
extension (cm)
Scale:- VS 1cm represents
50gm
HS 1cm represents
0.5cm
350
300
*
250
*
200
100
1
0
0
150
*
*
*
*
Change in
mass (gm)
Change in extension (cm)
50
0
0.5
1.0
1.5
2.0
2.5 3.0 3.5 4.0
4.5 5.0 5.5 6.0 6.5 7.0 7.5
8.0
4. From the graph the calculated
slope is:s=change in mass (gm)
change in extension (cm)
s=350-150
6.5-1.5
s=200
5.0
s=40gm/cm
5.The relationship In this
experiment is that mass is
directly proportional to extension
• HOOKE’S Law states that "Tension is
directly proportional to extension provided
that the elastic limit is not exceeded"
Qn.6
Sources of Errors
Precautions
Wind blowing
Zero error Adjustment
Setting Apparatus
Misreading of Values
Closing all Windows
including a door during
the Experiment
To be accuracy
Be aware on using a
old Instruments
To read the value
accuracy