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New friction pp
 

New friction pp

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Power Point Friction

Power Point Friction

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    New friction pp New friction pp Presentation Transcript

    • Friction
    • What is friction?What do you think friction is?Take an educational guess...
    • 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.
    • 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
    • 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 ______??
    • Examples of Friction• We can keep our hands warm by RUBBING them together fast.• Let’s try this!!
    • 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.
    • Types of Friction?• Rolling friction Static friction• Fluid friction Sliding friction
    • Rolling Friction• The resistance between two surfaces Example:• Tire rolled one way but the road was still
    • 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!
    • 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
    • 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
    • Let’s look at a video!http://www.youtube.com/watch?v=Zlhyw8fU1hI
    • 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!
    • Give up?Let’s begin the race!!
    • After Activity...Review GameLets Review!