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Semelhante a New friction pp
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New friction pp
- 1. Friction
- 2. What is friction? What do you think friction is? Take an educational guess...
- 3. Educational Guess ✴Friction is a force that opposes motion. ✴Makes it difficult for an object to move across a surface ✴The action of one surface or object rubbing against another.
- 4. Friction is everywhere! • Friction is everywhere Can you give me examples where I can find friction? • Let’s think about it! Friction occurs every day in our daily lives
- 5. Examples of Friction • Humans being able to walk--we use friction to move! Sitting in a chair and not slide off the chair--friction keep us sitting in our seats • We can keep our hands warm by ______??
- 6. Examples of Friction • We can keep our hands warm by RUBBING them together fast. • Let’s try this!!
- 7. Examples of Friction • Cars stop by using breaks--which use friction to stop the rotation of the wheels Trains have steel wheels and run on steel tracks--which its weight and friction allows the wheel to turn • Car tires operate on the road--Why? Because of friction--tires rubbing the road creates friction.
- 8. Types of Friction? • Rolling friction Static friction • Fluid friction Sliding friction
- 9. Rolling Friction • The resistance between two surfaces Example: • Tire rolled one way but the road was still
- 10. Static Friction • Friction is between two surfaces that are not moving past each other Example: • When the balloon is rubbed on your hair...Static friction is created!
- 11. Fluid Friction • When an object is moving in liquid or gas Example: When you drink from a straw, the fluid inside the cup was forced to go through the straw...Why? Because GREATER FRICTION
- 12. Sliding Friction • The force that opposes the motion of two surfaces that past each other Example: • When you go down the slide, you create sliding friction
- 13. Let’s look at a video! http://www.youtube.com/watch?v=Zlhyw8fU1hI
- 14. Today’s Activity... • We are predicting and testing an experiment! Materials: toy cars, ramps, towels, masking tape, paper, pencils, stop watch (timer), and calculator. • The question is what are we going to do with these materials today? Let’s think about!
- 15. Give up? Let’s begin the race!!
- 16. After Activity...Review Game Let's Review!