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Hookes Law The following topics will be discussed in this presentation: 1. Hookes law 2. Elastic behaviour of materials by stretching a spring and producing.

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Presentation transcript:

clamp stand ruler masses on holder Experiment to find extension of spring with different masses Set up of equipment spring clamp stand ruler masses on holder

Instructions Set up the equipment as shown in diagram. Measure the length of the spring in centimetres (cm) for each mass you add – starting from 0g to the maximum number of masses given to you. Write your results in the table as shown by your teacher. Work out from your results the extension of the spring in centimetres (cm). Draw a graph of your results.

Complete the table with your results MASS (g) FORCE (N) LENGTH (cm) EXTENSION (cm)

How to find the extension of a spring Normal Length Length Extension Extension = length – normal length Masses on holder

Extension (cm) Force (N) 1 2 3 4 5 6 7 8 9 10 DRAW A BEST LINE OF FIT GRAPH FROM YOUR PLOTTED RESULTS EXAMPLE GRAPH Extension 20 18 16 BEST LINE OF FIT 14 12 10 8 6 4 (cm) 2 1 2 3 4 5 6 7 8 9 10 Force (N)

Finding the relationship between Force and Extension – HOOKE’S LAW Force (N) Extension (cm) 20 18 0 0 1 2 2 4 3 6 4 8 5 10 6 12 7 14 8 16 9 18 10 20 16 14 12 10 8 6 4 (cm) 2 1 2 3 4 5 6 7 8 9 10 Force (N)

The graph shows that when the force is doubled the extension of the spring is doubled. It also shows that when the force is halved the extension of the spring is halved. This means that the extension is proportional to the force added. This relationship is called :- HOOKE’S LAW

extension proportional to force added (Hooke’s Law) 26 24 22 B breaking Point 20 Extension 18 16 14 A 12 10 elastic Limit 8 6 4 extension proportional to force added (Hooke’s Law) 2 (cm) 1 2 3 4 5 6 7 8 9 10 12 14 16 18 20 Force (N)

Find the extension of the following spring combinations

Find the lengths of the following springs