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16 th Oct 09 Friction

16 th Oct 09 Friction. Learning Objectives To know what friction is. To learn some uses for friction. Learn ways to reduce friction. Keywords: Friction. What is friction?. Rub your hands together for a minute. How does that feel?. What causes the heat?.

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16 th Oct 09 Friction

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  1. 16th Oct 09Friction Learning Objectives To know what friction is. To learn some uses for friction. Learn ways to reduce friction. Keywords: Friction

  2. What is friction?

  3. Rub your hands together for a minute. How does that feel? What causes the heat? There is resistance to the rubbing motion. The name of this resistant force isFRICTION • Friction can • Produce heat • Wear things away • Slow things down • Make a noise

  4. Friction always tries to slow moving objects down. It opposes motion. • It is a force between 2 touching objects.

  5. Write down the numbers in your book for the missing words. 1. force 2. rough 3. smooth 4. surfaces Friction is a ___________________ caused by two __________________ moving over each other. ___________________ surfaces produce more friction than __________________ surfaces.

  6. Friction can be a friend or a enemy at times.

  7. Bear did not read the warning sign

  8. Writing You can not hold a pencil in your hand without friction. The pencil lead would not make a mark on the paper without friction.

  9. A pencil eraser uses friction to rub off mistakes written in pencil lead.

  10. Driving car Your car would not start moving if it wasn't for the friction of the tyres against the street. With no friction, the tyres would just spin. Likewise, you could not stop without the friction of the brakes and the tyres.

  11. Cars have a brake system that uses friction between the rear tyres and the brake pads to slow down or stop the car.

  12. Multiple choice Game

  13. A unit of force is: A Newton B Metre C Gram D Kilogram

  14. A unit of force is: A Newton B Metre C Gram D Kilogram

  15. Which example shows unhelpful friction? A Friction between the tyre and the road. B Friction between the paper and the point of the pen. C Friction in the wheel axles of the bicycle. D Friction between your shoes and the floor.

  16. Which example shows unhelpful friction? A Friction between the tyre and the road. B Friction between the paper and the point of the pen. C Friction in the wheel axles of the bicycle. D Friction between your shoes and the floor.

  17. Which of the following about friction is incorrect A Friction slows down a ball rolling in grass. B Friction wears away tyres. C Friction can speed up a falling object. D Friction makes objects hotter.

  18. Which of the following about friction is incorrect A Friction slows down a ball rolling in grass. B Friction wears away tyres. C Friction can speed up a falling object. D Friction makes objects hotter.

  19. Which of these produce friction when they rub together A A rough surface and a smooth one. B 2 smooth surfaces. C 2 rough surfaces. D 2 smooth surfaces with oil between them.

  20. Which of these produce friction when they rub together A A rough surface and a smooth one. B 2 smooth surfaces. C 2 rough surfaces. D 2 smooth surfaces with oil between them.

  21. Which of the following is not an example of a lubricant? A Grease for bicycle chains. B Rubber on car tyres. C Water on swimming pool tiles. D Oil in car engines.

  22. Which of the following is not an example of a lubricant? A Grease for bicycle chains. B Rubber on car tyres. C Water on swimming pool tiles. D Oil in car engines.

  23. A force is a A A spring. B A movement. C An engine. D A push or a pull.

  24. A force is a A A spring. B A movement. C An engine. D A push or a pull.

  25. Friction is A A non contact Force. B A magnetic force. C A contact force. D Uses static electricity.

  26. Friction is A A non contact Force. B A magnetic force. C A contact force. D Uses static electricity.

  27. What is the frictional force that slows something down through the air? A Streamlining B Gravity C Thrust D Air resistance

  28. What is the frictional force that slows something down through the air? A Streamlining B Gravity C Thrust D Air resistance

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