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# Hookes law. tpack at kibasila sec school

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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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### Hookes law. tpack at kibasila sec school

1. 1. VERIFICATION OF ELASTIC MATERIALS
2. 2. APPARATUS USED <ul><li>Meter rule. </li></ul><ul><li>Spiral spring. </li></ul><ul><li>Scale pan. </li></ul><ul><li>Slotted weight of 50g, 100g, 150g, 200g, 250g, 300g. </li></ul><ul><li>Pointer. </li></ul><ul><li>Retort stand. </li></ul>
3. 3. DIAGRAMS Bench Bench Retort stand Retort stand Scale pan Spiral Spring Meter ruler pointer 50g 100g 200g 350g 100cm 1cm
4. 4. PROCEDURES <ul><li>From the arranged apparatus as shown in the diagram record the length (L o ). </li></ul><ul><li>Put the slotted weight of 50g in scale pan and record the new length (L) </li></ul><ul><li>Repeat the procedure no.2 for the weights of 100g,150g,200g,250g,and 300g. </li></ul>
5. 5. TABLE OF VALUES Mass(g) Length(L) Extension(cm) (L-Lo) 50 100 150 200 250 300
6. 6. Questions <ul><li>What is the aim of this experiment? </li></ul><ul><li>Complete the table of results below. </li></ul><ul><li>Draw the graph of mass against extension. </li></ul><ul><li>Calculate the slope from the graph. </li></ul><ul><li>State the relationship between mass and extension. State Hooke’s Law . </li></ul><ul><li>State the sources of errors and precautions in this experiment. </li></ul>
7. 7. DURING THE EXPERIMENT Bench Bench Retort stand Retort stand Spiral Spring Meter ruler pointer 60g 61g 62g 63g 64g 65g 66g 67g 100g 150g 200g 250g 300g 350g pointer pointer pointer 50g
8. 8. DURING THE EXPERIMENT Bench Bench Retort stand Retort stand Spiral Spring Meter ruler pointer 60g 61g 62g 63g 64g 65g 66g 67g 100g 150g 200g 250g 300g 350g pointer pointer pointer
9. 9. Bench Bench Retort stand Retort stand Spiral Spring Meter ruler pointer 60CM 61CM 62CM 64CM 65CM 66CM 67CM 100g 150g 200g 250g 300g 350g pointer pointer pointer 63CM
10. 10. Table values The original length L o = 61cm AIM ;-To find the relationship between mass and extension of a material Mass, m (g) 50 150 200 250 300 350 Pointer reading, (cm) 62.6 64.0 65.0 66.3 67.5 Extension e=(S-S o ) cm 1.6 3.0 4.0 5.3 6.5
11. 11. 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)
12. 12. 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
13. 13. 5.The relationship In this experiment is that mass is directly proportional to extension <ul><li>HOOKE’S Law states that &quot; Tension is directly proportional to extension provided that the elastic limit is not exceeded &quot; </li></ul>
14. 14. Qn.6 Sources of Errors Precautions <ul><li>Wind blowing </li></ul><ul><li>Zero error Adjustment </li></ul><ul><li>Setting Apparatus </li></ul><ul><li>Misreading of Values </li></ul><ul><li>Closing all Windows including a door during the Experiment </li></ul><ul><li>To be accuracy </li></ul><ul><li>Be aware on using a old Instruments </li></ul><ul><li>To read the value accuracy </li></ul>
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