Coefficient of Friction

What is the coefficient of friction?

• A dimensionless number representing the ratio of resistive force to normal force

• A measure of the weight of an object

• The angle at which an object begins to slide

• The force required to stop an object

Which type of friction prevents a stationary object from moving?

• Static friction

• Kinetic friction

• Rolling friction

• Molecular friction

How is the coefficient of static friction related to an inclined plane?

• It can be calculated using the angle at which an object begins to slide

• It is irrelevant to inclined planes

• It increases as the incline angle decreases

• It is the same as kinetic friction on an incline

Why is kinetic friction generally lower than static friction?

• Less force is required to keep an object moving than to start its movement

• It depends on the surface texture

• It is affected by the weight of the object

• It increases with speed

What is a direct method to determine the coefficient of friction?

• Measuring the force required to separate two materials

• Calculating the angle of an inclined plane

• Observing the time it takes for an object to stop

• Using the weight of the object