Chapter4 RESISTANCE. Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force.

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Presentation transcript:

Chapter4 RESISTANCE

Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force required to start relative motion between two objects Kinetic Friction (F kinetic ) - the force required to maintain a constant speed between two surfaces in contact

WHAT CAN BE DONE TO DECREASE THE AMOUNT OF FRICTION EXPERIENCED BY TWO OBJECTS?

Static friction is usually greater than the kinetic friction. This is due in part as a result of how hard the surfaces are pressed together. This is called the normal force (F N )

Coefficient of Friction ( μ ) The ratio of maximum force (static or kinetic) of friction to the normal force between the two surfaces in contact.

Surface μSμS μKμK Wood on wood Wood on concrete Rubber on dry concrete Rubber on wet concrete Steel on steel (dry) Steel on steel (oiled) Steel on Teflon0.04

Lab Preview A spring scale will be used to determine the pulling force required to get the sled to move?

Determining Kinetic Coefficients of Friction

Lab Preview SurfaceMass of Sled (kg) Mass Added (kg) Total Mass (kg) Weight of Sled and Mass (Newtons) Ivory on Dry Metal

Lab Preview SurfaceKinetic Friction Force Normal ForceCoefficient of Kinetic Friction Ivory on Dry Material μ K = (Kinetic Friction Force) / Normal Force