Types of Friction
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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.

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Friction

  • 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)


Opposing Sliding

  • 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 Friction

  • 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 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

  • 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

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

  • Examples:

    • skydivers jump out of a plane

    • boat traveling through water



Question

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


Question

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

Answer

  • Rolling Friction (roller skates)

  • Sliding Friction (plate sliding across a table)

  • Static Friction (pushing a desk)

  • Fluid Friction (a person swimming through the water)


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