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Project in Science Methods Class
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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 FrictionFriction 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!