1 / 15

# Types of Friction - PowerPoint PPT Presentation

Types of Friction. . Friction. Every day you see moving objects come to a stop. The force that brings nearly everything to a stop is friction FRICTION is the force that acts to resist movement between two touching surfaces. Friction, continued.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Types of Friction' - fraley

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

• Every day you see moving objects come to a stop.

• The force that brings nearly everything to a stop is friction

• FRICTIONis the force that acts to resist movement between two touching surfaces.

Friction, continued

• Objects cannot move with a constant speed unless a net force is applied because friction is always acting to slow down the motion

• If friction could be removed, an object in motion would continue to move in a straight line with constant speed.

Friction, continued

• In the vacuum of outer space, there is no friction to slow motion

• Therefore objects continue to move indefinitely (like the moon around the earth)

• If two objects are in contact, frictional forces always try to prevent one object from sliding on the other object.

• If you rub your hand against a tabletop, you can feel the friction push against the motion of your hand.

• Friction will always slow an object down.

• STATIC FRICTIONprevents an object from moving when a force is applied

• It is caused by the attraction between atoms on the 2 touching surfaces which cause the surfaces to stick together

Static Friction, continued

• To move the object, you have to exert a force large enough to break the bonds holding two surfaces together.

• Generally, the rougher the surface or the heavier the object, the more static friction.

• SLIDING FRICTIONslows down an object that slides.

• You have to keep pushing to overcome the force of sliding friction.

Sliding Friction, continued

• Sliding friction is due to the microscopic roughness of two surfaces.

• A force must be applied to move the rough areas of one surface past the rough areas of the other.

• What are some examples of sliding friction you encounter in your everyday life?

• ROLLING FRICTION, occurs between the ground and the part of the tire touching the ground.

• Rollingfriction keeps the tire from slipping on the ground and exerts force on the tires that pushes the object forward.

Rolling Friction, continued

• Why does a cart have wheels?

• It’s usually easier to pull a load on a wagon or cart that has wheels rather than drag the load along the ground.

• Rolling friction between the wheels and the ground is LESS than the sliding friction between the load and the ground.

• FLUID FRICTION occurs between an object and air or water.

• Examples:

• skydivers jump out of a plane

• boat traveling through water

List and give an example of the four types of friction:

List and give an example of the four types of friction: