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# Lesson 13 hooke's law

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### Lesson 13 hooke's law

1. 1. Last lesson Investigating my (Robert Hooke) law.
2. 2. Forces and springs
3. 3. Robert Hooke
4. 4. Investigating forces and springs You are going to investigate how much a spring stretches when a force is applied to it. The amount a spring stretches is called its extension. This is the difference in length between the stretched spring and the length of the spring when it was unstretched. (Remember we are looking at the force on the spring. A mass of 100g will have a weight (force of gravity pulling it down) of 1 Newton.• Add masses to your spring and carefully measure its extension. You can do this until the spring breaks! (but you must wear goggles and be careful during this investigation). Your experimental report will include the following• A table of results• A graph of your results• A conclusion describing what you have discovered (think about this!)
5. 5. Table of resultsForce (N) Length of spring Extension (cm) (cm)0 3.4 01 5.4 22 7.4 43 9.4 6
6. 6. Table of resultsForce (N) Length of spring Extension (cm) (cm)0 0123
7. 7. GraphExtension (cm) Force (N)
8. 8. Go!
9. 9. Hooke’s law Elastic limit The extension of aForce spring is proportional(N) to the force applied (until the elastic limit is reached) Extension (cm)
10. 10. Can you reads pages 60 and 61 and answer the questions on those pages?
11. 11. Friday 14th NovemberEnd of Topic test(ALL of the stuffwe’ve done this year!)