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Physics M2 Hooke's Law applications -part 1
This document discusses Hooke's law and its applications. It begins by stating the objectives of understanding Hooke's law, compression, tension, and torsion. It then provides examples of how Hooke's law is applied in various areas: 1) Springs are used in shock absorbers for vehicles, weapons like crossbows, and precision instruments like spring scales. 2) Rubber and other elastic materials dampen vibrations in machinery, buildings to protect against earthquakes, and vehicles through bumpers. 3) A quiz is provided to test the understanding of Hooke's law applications.
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Physics M2 Hooke's Law applications -part 1
- 1. Physics Module2 Unit 1 Lessons 8 and 9 BEGINBEGIN
- 2. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Several forces act on a body at any given time. Do all bodies react to stretching and compression forces in the same manner? Can you imagine how amazed Robert Hooke would be if he was alive today, to see the numerous applications of his investigation! 2
- 3. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane At the end of this slide presentation, you should be able to : Recall Hooke’s Law Recall what is compression, tension and torsion Identify and explain the numerous applications of Hooke’s Law in the following areas: Use of elastic materials 3
- 4. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Let’s see how much you can recall about forces!
- 5. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Indicate which statement is true and which is false by clicking onTRUE or FALSE.The correct answer will change colour. TRUE FALSE FALSE FALSE TRUE TRUE TRUE FALSE TRUE FALSE TRUE FALSE MORE FEEDBACKMORE FEEDBACK
- 6. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane 1. False. Elastic materials when the applied force is removed, DOES returns to its original length, provided that the elastic limit is not exceeded. 2. True. Plastic materials when the applied force is removed, DOES NOT return to its original length. 3. True. deformation is the change in the shape and length of a body when a force is applied. 4. False. Tension is a force that occurs within a body when stretching and compression forces are applied to it. 5. True. torsion is twisting of a material as result of stretching and compression forces. 6. False. Hooke’s law states that the extension is directly proportional to the applied force, provided that the limit of proportionality/elastic limit is not exceeded.
- 7. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Shock absorbers – rigid springs attached to each wheel of the vehicle. Compressive forces in the spring counteract the vertical up and down movements of the vehicle, enabling a smooth journey.
- 8. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Self – reloading weapons –When the strings of the crossbow is stretched, when released the tension in the string propels the bow forward. A spring pushes another bow upwards into position for firing.
- 9. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Self- reloading gun-There is an elaborate arrangement of springs that aid in the high speed propulsion and reloading of bullets.
- 10. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Most modern buildings in Japan are constructed with springs at the base to dissipate energy due to earth quake forces.
- 11. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane This is another design for earthquake proof buildings, where the springs allow the building to move in the direction of the seismic energy and prevent the building from breaking apart as a result of the shaking.
- 12. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Compression plates – can used in the transportation of highly flammable and explosive materials to cancel out vertical and lateral movements.
- 13. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Anti-vibration dampeners - used to minimize vibration.
- 14. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Stockbridge damper - used to minimize vibration of power transmission lines caused by winds or birds.
- 15. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Precision Instruments - the ability of the spring to remove to its original length when the applied force is removed ensure the accuracy and reliability of the instrument. For compression testers, spring scale.
- 16. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Spring scale – when a person steps onto the scale, the spring is connected to the needle and is moves across the scale. When the person steps off, the spring recoils and the needle go back to the 0 graduation mark.
- 17. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Another earthquake –proof design for buildings, where the base of the building is isolated supported on rubber bearings in a moat.
- 18. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Some buildings are built where the base of the building is separated from the foundation by being placed on rubber bearings.
- 19. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Steel dampening bolts – these are used to prevent vibration and prevent stress to the structure.
- 20. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Bumper protectors - to absorb the shock of another car bumping into your vehicle especially when parked in parking lots, where cars get scratched in a bump and run!
- 21. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Rubber is a cheap material that is used where machinery made up to different parts are fitted with rubber to dampen vibrations and mechanical noises.This ensure optimal performance of the machinery.
- 22. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Urethane is preferred by product designers as it provide longer service life compared to plastics and minimizes noise compared to metals. It is used to make saw blade clamps and jackhammer handle grips, as its anti-vibrational properties help to prevent tendinitis and Carpel tunnel syndrome.
- 23. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Are you ready to test yourself? There are five multiple choice items that you are required to do. For each item, click on the letter of the correct response and then click the button ‘NEXT QUESTION’ to continue. Click the ‘BEGIN QUIZ’ button to start doing the quiz. 23 BEGIN QUIZ!
- 24. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Using the table below, what would be the length of the spring when the load is 70 N? 24 A. 8.0 cmA. 8.0 cm B. 60 cmB. 60 cm C. 7.25 cmC. 7.25 cm D. 7.5 cmD. 7.5 cm FEEDBACKFEEDBACKFEEDBACKFEEDBACK Load /N 0 20 40 60 80 Length /cm 4.0 5.0 6.0 7.0 8.0
- 25. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Using the table below, what would be the length of the spring when the load is 70 N? A No. B No C No D YesThe extension is directly proportional to the force, so 70 N will be halfway between 7. 0 and 8.0 cm 25 NEXT QUESTIONNEXT QUESTIONNEXT QUESTIONNEXT QUESTION
- 26. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Using the table from question 1, from the results it may be deduced that the extension of the spring is: 26 A. Inversely proportional to the load.A. Inversely proportional to the load. D. Inversely proportional to the square of the load. D. Inversely proportional to the square of the load. C. Directly proportional to the square of the load.C. Directly proportional to the square of the load. B. Directly proportional to the load.B. Directly proportional to the load. FEEDBACKFEEDBACKFEEDBACKFEEDBACK
- 27. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Using the table from question 1, from the results it may be deduced that the extension of the spring is: A No. B Yes; Hooke’s law states that extension is directly proportional to the load provided that the elastic limit is not exceeded. C No. D No. 27 NEXT QUESTIONNEXT QUESTIONNEXT QUESTIONNEXT QUESTION
- 28. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane I – section steel beams are preferred to ordinary steel beams because they have : 28 A. Lower tensile strength compare to ordinary steel beams. A. Lower tensile strength compare to ordinary steel beams. D. It bends more easily than ordinary steel beams. D. It bends more easily than ordinary steel beams. C. It is cheaper than ordinary steel beams.C. It is cheaper than ordinary steel beams. B. Higher tensile strength compare to ordinary beams. B. Higher tensile strength compare to ordinary beams. FEEDBACKFEEDBACKFEEDBACKFEEDBACK
- 29. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane I – section steel beams are preferred to ordinary steel beams because they have : A No. B Yes.The top and bottom plate separated by a stringer increases the tensile strength of I beams. C No. they are more, not significant to answer. D No. the answer is partially correct. 29 NEXT QUESTIONNEXT QUESTIONNEXT QUESTIONNEXT QUESTION
- 30. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane A semi-automatic pistol can fire several bullets in a short period of time.This is possible because: 30 A. It has a magazine that holds up to 14 bullets.A. It has a magazine that holds up to 14 bullets. D. The bullets are light weight and move very fast.D. The bullets are light weight and move very fast. C. It uses springs to eject empty cartridges.C. It uses springs to eject empty cartridges. B. It uses springs to reload and propel bullets.B. It uses springs to reload and propel bullets. FEEDBACKFEEDBACKFEEDBACKFEEDBACK
- 31. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane A semi-automatic pistol can fire several bullets in a short period of time.This is possible because: A No. the answer is partially right, it does have a magazine holding up to 25 bullets in some pistols. B Yes.When a pistol releases a bullet, a spring at the base of the magazine pushes up another bullet into position. C No; the answer is partially correct. D No; the answer is partially correctly, not relevant to answer. 31 NEXT QUESTIONNEXT QUESTIONNEXT QUESTIONNEXT QUESTION
- 32. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Sports utility vehicles are best suited for a comfortable ride to the hilly terrains of the Blue mountains.What feature in the vehicle makes the ride so comfortable? 32 B. It is very wide and can drive over most of the potholes . B. It is very wide and can drive over most of the potholes . D. It has a wide wheel base and does not topple easily. D. It has a wide wheel base and does not topple easily. C. It has large rubber tires that oppose any upward movement. C. It has large rubber tires that oppose any upward movement. A. Huge suspension springs attached to each wheel. A. Huge suspension springs attached to each wheel. FEEDBACKFEEDBACKFEEDBACKFEEDBACK
- 33. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Sports utility vehicles are best suited for a comfortable ride to the hilly terrains of the Blue mountains.What feature in the vehicle makes the ride so comfortable? A Yes.The springs absorb and cancel any upward acting forces. B No; the wheel cannot miss every rut on the road surface. C No; rubber can absorbs only some of the upward acting forces. D No. the answer is not relevant to the topic. 33END OF QUIZEND OF QUIZEND OF QUIZEND OF QUIZ
- 34. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane You have reached the end of the quiz. If you wish to review this lesson, go to the first slide. If you have finished viewing the lesson, click the Close (X) button. 34
- 35. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Coverslide Trusses in roof http://t3.gstatic.com/images?q=tbn:ANd9GcSK-qZ9ODjDpNietRHXc1z Bus stop http://www.edilportale.com/immagini/prodotti-thumb/b_prodotti-5083 Rubber mounts http://www.clubchopper.com/photopost/data/500/Rubber_Mounts_25_ Slide 8 http://www.techauto.ca/images/Suspension2.jpg Slide 9 http://media.midwayusa.com/productimages/880x660/primary/418/41
- 36. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Slide 10 Self reloading gun http://www.guns.com/wp-content/uploads/2013/05/steyr_diagram.jpg Slide 11 http://www.serviciofilipino.com/pmm/images/article_pic_big.jpg slide 12 http://scilearn- hscs2012.wikispaces.com/file/view/3884740118_72e20c0981.jpg/342 753974/3884740118_72e20c0981.jpg Slide http://www.iyrs.edu/Portals/0/Uploads/Images/BlogImages/Blog2%2014 2.jpg Slide 17 http://i.dailymail.co.uk/i/pix/2008/07/22/article-1037140- 01F2DEBD00000578-174_233x357.jpg
- 37. OBJECTIVESOBJECTIVES TEST YOURSELF!TEST YOURSELF! Hooke’sLaw applications Use of Elastic Materials Hooke’s Law applications Use of Elastic Materials QUIZQUIZ INTRODUCTIONINTRODUCTION SpringsSprings RubberRubber UrethaneUrethane Compression tester http://www.p-wholesale.com/upimg/19/728a1/compression-tester-ye- 2000c-747.jpg Urethane http://www.hellotrade.com/american-urethane-incorporated/saw- blade-clamps-jackhammer-handle-grips-power-tool-industry.html Spring scale http://www.google.com.jm/imgres?q=%27diagram+of+components+of+ +a+spring+balance %27&num=10&hl=en&biw=1280&bih=666&tbm=isch&tbnid=Qjk32 DsBMO5_DM:&imgrefurl=http://www.ehow.com/how- does_4607670_a-scale- work.html&docid=AupmCxRdto_HMM&imgurl=http://img.ehowcdn . Bumper guard http://www.allaround- bumperguards.com/image/61428939_scaled_416x320.jpg