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Power Point Friction
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Friction
What is friction?
Take an educational guess...
What do you think friction is?
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 Game
Let's Review!
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