friction 1111.pptx gi8697070969685645t3536

physics friction

1. Pair Share: Quick Draw What is the word/words that can be associated with the word “Friction”? Do in a sheet of paper.

2. Friction and Gravity What is Friction?   Friction is the resistance to the sliding, rolling, or flowing motion of an object due to its contact with another object. When a moving object comes in contact with another object, friction is the opposing force that slows or stops the moving object. . Without friction, an object would continue to move at  constant speed forever. The strength of the force of friction depends on the type of surfaces and how hard the surfaces push together. Rough surfaces produce greater friction than smooth surfaces.

3. Three Types of Friction   Static Friction Sliding Friction Rolling Friction Fluid Friction

4. Sliding Friction  • A resistance to movement that is created when two things rub together.

5. Rolling Friction   When an object rolls over a surface. Skateboard Example: The wheels and ball bearings in the wheels are used to reduce friction between the floor and the skateboard. The skateboard will slow and stop due to the friction between the floor and the skateboard.

6. Fluid Friction   The force that tries to slow objects down when they move through a liquid or a gas. It's also known as "drag", or "air resistance". All gases and liquids are fluids. • An airplane and a swimmer both experience fluid friction.

7. Ways to Reduce Friction Smooth the surface Put ball bearings in wheels Replace rolling with sliding Add oil or another type of lubricant

8. What force opposes the motion of an object? Why is friction important in our daily life? How can friction be helpful or harmful?

9. Activity Time Do page 136