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# New friction pp

## on Mar 13, 2012

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Power Point Friction

Power Point Friction

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## New friction ppPresentation 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!