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WESBURY COLLEGE OF SCIENCE

WESBURY COLLEGE OF SCIENCE

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WESBURY COLLEGE OF SCIENCE

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  1. WESBURY COLLEGE OF SCIENCE 2013 GR 12 PHYSICAL SCIENCES INTERVENTION FOR SCIENCE LEARNERS SCIENCE DEPARTMENT PROJECTFOUNDATIONS OF LEARNING 2013-09-01 1

  2. KNOWLEDGE AREAS MECHANICS CHEMICAL CHANGE WAVES, LIGHT, SOUND MATTER AND MATERIALS ELECTRICITY AND MAGNETISM CHEMICAL SYSTEMS 2

  3. KNOWLEDGE AREAMECHANICS THEMES • FORCE, MOMENTUM AND IMPULS (GR 11 MECHANICS) • MOMENTUM (GR 12 MECHANICS) • VERTICAL PROJECTILE MOTION (GR 12 MECHANICS) • FRAMES OF REFERENCE (GR 12 MECHANICS) • WORK, POWER AND ENERGY (GR 12 MECHANICS)

  4. KNOWLEDLEDGE AREAMECHANICS THEME • FORCE, • MOMENTUM AND • IMPULSE GR 11 MECHANICS

  5. FORCE, MOMENTUM AND IMPULSE FORCE TWO TYPES OF FORCES-PUSHING AND PULLING FORCE

  6. FORCE, MOMENTUM AND IMPULSE FORCE CONTACT AND NON-CONTACT FORCES

  7. FORCE, MOMENTUM AND IMPULSE INTERACTION BETWEEN TWO BODIES TYPES OF FORCES

  8. FORCE, MOMENTUM AND IMPULSE FORCE DIAGRAM • FREE BODY DIAGRAMS • OBJECT REPRESENT A DOT • FORCES ARE DRAWN AS ARROWS POINTING AWAY FROM THE • DOT • LENGTH OF ARROW REPRESENTS SIZE OF FORCE • POINT OF ARROW INDICATES THE DIRECTION OF THE FORCE FREE BODY DIAGRAM

  9. FORCE, MOMENTUM AND IMPULSE NEWTONS THIRD LAW OF MOTION WHEN A BODY (A) EXERTS A FORCE ON A SECOND BODY (B), THE SECOND BODY (B) EXERTS A FORCE EQUAL IN MAGNITUDE, BUT OPPOSITE IN DIRECTION ON THE FIRST BODY (A) FORCES WORK IN PAIRS – NEWTON’S THIRD LAW OF MOTION

  10. FORCE, MOMENTUM AND IMPULSE FORCES WORK IN PAIRS THE FORCE OF THE GROUND ON YOUR FOOT PUSHES YOU FORWARD

  11. FORCE, MOMENTUM AND IMPULS FORCES WORK IN PAIRS NEWTON’S THIRD LAW OF MOTION EXPLAINS THE MOVEMENT OF THE BALLOON ROCKET

  12. FORCE, MOMENTUM AND IMPULSE FORCES WORK IN PAIRS NEWTON’S THIRD LAW OF MOTION EXPLAINS THE MOVEMENT OF THE BALLOON ROCKET

  13. FORCE, MOMENTUM AND IMPULSE FORCES WORK IN PAIRS NEWTON’S THIRD LAW BOOK ON TABLE

  14. FORCE, MOMENTUM AND IMPULSE ANALYSE THE SCIENTIFIC CORRECTNESS OF THE FOLLOWING STATEMENT ABOUT A HORSE PULLING A CART: “WHEN A HORSE PULLS A CART, THE CART PULLS THE HORSE WITH AN EQUAL BUT OPPOSITE FORCE, …….. CONSEQUENTLY THE FORCES CANCEL EACH OTHER OUT AND THE CART IS UNABLE TO MOVE” FORCES WORK IN PAIRS

  15. “… WHEN A HORSE PULLS A CART, THE CART PULLS THE HORSE WITH AN EQUAL BUT OPPOSITE FORCE, …” • ACCORDING TO NEWTON’S THIRD LAW THIS PART OF THE • STATEMENT TRUE!!!!!!!! • THE CART PULLS THE HORSE WITH AN EQUAL BUT OPPOSITE • FORCE THAN WHAT THE HORSE IS PULLING THE CART. • CONSEQUENTLY THE FORCES CANCEL EACH OTHER OUT AND THE CART IS UNABLE TO MOVE” • THIS PART OF THE STATEMENT IS NOT TRUE!!!!!!!!!!!! • THE TWO FORCES ACT ON DIFFERENT OBJECTS AND CAN • THEREFOR NOT CANCEL EACH OTHER OUT. • ONLY THE FORCES THAT ACT IN ON THE CART – • 1 APPLIED FORCE OF THE HORSE • FRICTION OF CART • WILL DETEMINE IF THE CART WILL MOVE. FORCE, MOMENTUM AND IMPULSE FORCES WORK IN PAIRS

  16. FORCE, MOMENTUM AND IMPULSE NEWTONS LAW OF MOTION (ESA)

  17. • THE TWO FORCES WORK SIMULTANEOUSLY AND HAVE THE SAME MAGNITUDE • THE TWO FORCES HAVE OPPOSITE DIRECTIONS • THE TWO FORCES ARE THE SAME - BOTH FRICTIONAL OR NORMAL FORCES • IF TWO FORCES ACT ON DIFFERENT OBJECTS AND CAN THEREFORE NOT CANCEL EACH OTHER OUT • ONLY FORCES ACTING ON THE SAME OBJECT CAN CANCEL EACH OTHER OUT FORCE, MOMENTUM AND IMPULSE UNDERSTANDING OF NEWTON’S THIRD LAW OF MOTION

  18. FORCE, MOMENTUM AND IMPULSE MOMENTUM – AMOUNT OF MOTION ANY MOVING OBJECT HAS MOMENTUM

  19. FORCE, MOMENTUM AND IMPULSE WHAT IS LINEAR MOMENTUM? LINEAR MOMENTUM (MOMENTUM IN A STRAIGHT LINE) CAN BE DEFINED AS THE PRODUCT OF MASS AND VELOCITY

  20. FORCE, MOMENTUM AND IMPULSE CHANGE IN MOMENTUM A NET FORCE ON AN OBJECT CAUSES A CHANGE IN MOMENTUM - A TACKLE IN RUGBY CHANGES THE MOMENTUM OF THE OPPONENT

  21. FORCE, MOMENTUM AND IMPULSE NEWTONS SECOND LAW OF MOTION IN TERMS OF MOMENTUM THE NET (OR RESULTANT) FORCE EXERTED ON AN OBJECT IS EQUAL TO THE RATE OF CHANGE OF MOMENTUM

  22. FORCE, MOMENTUM AND IMPULSE THROWING AN EGG TO STOP THE EGG, THE MOMENTUM OF THE EGG MUST BE CHANGED TO ZERO THE CONTACT TIME IS THE ONLY SOLUTION TO ENSURE THAT THE EGG EXPERIENCE AS SMALL A FORCE AS POSSIBLE CHANGE IN MOMENTUM

  23. FORCE, MOMENTUM AND IMPULSE CHANGE IN MOMENTUM CATCH A WATER BALLOON TO STOP THE WATER BALLOON, THE MOMENTUM MUST BE CHANGED TO ZERO THE CONTACT TIME IS THE ONLY SOLUTION TO ENSURE THAT BALLOON EXPERIENCE AS SMALL A FORCE A POSSIBLE

  24. FORCE, MOMENTUM AND IMPULSE CHANGE IN MOMENTUM CRICKET PLAYER CATCHING A BALL THE CONTACT TIME IS THE ONLY SOLUTION TO ENSURE THAT CRICKET PLAYER EXPERIENCE A SMALL FORCE

  25. FORCE, MOMENTUM AND IMPULSE CHANGE IN MOMENTUM A BATSMAN HITTING A CRICKET BALL THE MAGNITUDE OF THE NET FORCE, AS WELL AS THE CONTACT TIME , WILL THE DETERMINE THE SUCCESS OF THE SHOT

  26. FORCE, MOMENTUM AND IMPULSE CHANGE IN MOMENTUM SUMMARY

  27. FORCE, MOMENTUM AND IMPULSE IMPULSE THE PRODUCT OF THE NET FORCE AND THE CONTACT TIME IS CALLED THE IMPULSE (N.s) OF THE FORCE

  28. FORCE, MOMENTUM AND IMPULSE THE CONCEPT OF IMPULSE AND SAFETY CONSIDERATIONS IN EVERYDAY LIFE AIRBAGS AIRBAGS INCREASES THE CONTACT TIME AND THE PASSENGER EXPERIENCE A SMALLER FORCE

  29. FORCE, MOMENTUM AND IMPULSE THE CONCEPT OF IMPULSE AND SAFETY CONSIDERATIONS IN EVERYDAY LIFE AIRBAGS

  30. FORCE, MOMENTUM AND IMPULSE THE CONCEPT OF IMPULSE AND SAFETY CONSIDERATIONS IN EVERYDAY LIFE CRUMPLE ZONES CRUMPLE ZONES INCREASES THE CONTACT TIME AND THE PASSENGER EXPERIENCE A SMALLER FORCE

  31. FORCE, MOMENTUM AND IMPULSE THE CONCEPT OF IMPULSE AND SAFETY CONSIDERATIONS IN EVERYDAY LIFE ARRESTOR BEDS ARRESTER BEDS INCREASES THE CONTACT TIME FOR A RUNAWAY TRUCK TO BE STOPPED

  32. FORCE, MOMENTUM AND IMPULSE WESBURY COLLEGE OF SCIENCE

  33. KNOWLEDLEDGE AREAMECHANICS THEME MOMENTUM GR 12 MECHANICS

  34. WHEN DOES MOMENTUM CHANGE? MOMENTUM CHANGES WHEN A NET FORCE ACTS ON AN OBJECT! WHEN IS MOMENTUM CONSERVED? WHEN THE NET FORCE THAT ACTS ON AN OBJECT IS ZERO, THE OBJECT DOES NOT EXPERIENCE AN ACCELERATION THEREFOR NO CHANGE IN VELOCITY. CONSERVATION OF MOMENTUM

  35. CONSERVATION OF MOMENTUM DURING A COLLISION TWO VEHICLES EXPERIENCE EQUAL BUT OPPOSITE FORCES

  36. CONSERVATION OF MOMENTUM • THE CONTACT TIME DURING WHICH THE FORCES ACT ON THE TWO VEHICLES IS/ARE THE SAME • THE VEHICLES EXPERIENCE THE SAME IMPULSE BUT IN OPPOSITE DIRECTIONS FA = -FB and tA= tB • FAtA = -FBtB • FAtA + FBtB = 0

  37. CONSERVATION OF MOMENTUM THE TOTAL LINEAR MOMENTUM IN A CLOSED SYSTEM IS CONSERVED IN MAGNITUDE AND DIRECTION

  38. CONSERVATION OF MOMENTUM THE TOTAL LINEAR MOMENTUM IN A CLOSED SYSTEM IS CONSERVED IN MAGNITUDE AND DIRECTION

  39. CONSERVATION OF MOMENTUM COLLISIONS AND EXPLOSIONS MOMENTUM STAY CONSERVED IN A CLOSED SYSTEM

  40. ELASTIC AND INELASTIC COLLISIONS COLLISIONS ARE OFTEN CLASSIFIED ACCORDING TO THE CHANGE IN TOTAL KINETIC ENERGY ELASTIC COLLISIONS TOTAL KINETIC ENERGY OF THE SYSTEM BEFORE THE COLLISION IS EQUALTO THE TOTAL KINETIC ENERGY AFTER THE COLLISION INELASTIC COLLISIONS TOTAL KINETIC ENERGY OF THE SYSTEM IS NOT THE SAMEBEFORE AND AFTER THE COLLISION

  41. ELASTIC AND INELASTIC COLLISIONS TOTAL KINETIC ENERGY BEFORE A COLLISION = TOTAL KINETIC ENERGY AFTER A COLLISION \ EkBEFORE COLLISION = EkAFTER COLLISION \ ½ mv2 = ½ mv2 ELASTIC COLLISIONS

  42. ELASTIC AND INELASTIC COLLISIONS ELASTIC COLLISIONS NEWTON’S CRADLE TOTAL KINETIC ENERGY BEFORE A COLLISION = TOTAL KINETIC ENERGY AFTER A COLLISION

  43. ELASTIC AND INELASTIC COLLISIONS ELASTIC COLLISIONS NEWTON’S CRADLE

  44. ELASTIC AND INELASTIC COLLISIONS ELASTIC COLLISIONS GIANT NEWTON’S CRADLE

  45. MECHANICS NNEWTONS CRADLE – PENDULUM WAVES

  46. ELASTIC AND INELASTIC COLLISIONS MOMENTUM WILL ALWAYS BE CONSERVED DURING COLLISIONS KINETIC ENERGY WILL ONLY BE CONSERVED DURING ELASTIC COLLISIONS SUMMARY

  47. MECHANICS MOMENTUM VIDEO

  48. MECHANICS WESBURY COLLEGE OF SCIENCE LEARNERS MODULE 1 p45-46 p47 p48 AKT 6. VRAE 1-4

  49. KNOWLEDLEDGE AREAMECHANICS • NEWTON’S SECOND LAW OF MOTION • NEWTON’S FIRST LAW OF MOTION GR 11 MECHANICS

  50. NEWTON’S SECOND LAW OF MOTION MATHEMATICAL EXPRESSION OF NEWTON’S SECOND LAW OF MOTION