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Physics team at kibasila sec school made an animation on the Hooke's law of Elasticity. These teachers have never used a computer before for teaching purposes. This lesson is a result of a two days workshop and collaboration in design teams
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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
Bench Bench
RetortstandRetort
stand
Scale pan
Spiral Spring
Meter ruler
pointer
50g 100g 200g350g
100cm
1cm
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) Length(L) Extension(cm)
(L-Lo)
50
100
150
200
250
300
Questions1. What is the aim of this experiment?
2. Complete the table of results below.
3. Draw the graph of mass against extension.
4. Calculate the slope from the graph.
5. 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
Bench
Bench
RetortstandRetort
stand
Spiral Spring
Meter ruler
pointer60g
61g
62g
63g
64g
65g
66g
67g
100g 150g 200g 250g 300g 350g
pointerpointerpointer
50g
DURING THE EXPERIMENT
Bench
Bench
RetortstandRetort
stand
Spiral Spring
Meter ruler
pointer60g
61g
62g
63g
64g
65g
66g
67g
100g 150g 200g 250g 300g 350g
pointerpointerpointer
Bench
Bench
RetortstandRetort
stand
Spiral Spring
Meter ruler
pointer60CM
61CM
62CM
64CM
65CM
66CM
67CM
100g
150g 200g 250g 300g 350g
pointerpointerpointer
63CM
Table valuesMass, m (g) 50 150 200 250 300 350
Pointer reading, (cm)
62.6 64.0
65.0 66.3 67.5
Extension
e=(S-So) cm
1.6 3.0 4.0 5.3 6.5
The original length Lo= 61cm
AIM;-To find the relationship between mass and extension of a material
A graph of mass (gm) against extension (cm)
Scale:- VS 1cm represents 50gm HS 1cm represents 0.5cm
50
100
100
150
200
0
250
300
350
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
**
**
**
Change in mass (gm)
Change in extension (cm)
4. From the graph the calculatedslope is:-
s=change in mass (gm) change in extension (cm)
s=350-1506.5-1.5s=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 blowingZero error AdjustmentSetting ApparatusMisreading of Values
Closing all Windows including a door during the ExperimentTo be accuracyBe aware on using a old InstrumentsTo read the value accuracy
