Which of the following statements is incorrect about...

Which of the following statements is INCORRECT about friction. (Choose all that apply and explain.) -The magnitude of kinetic friction is constant -Static friction provides torque for an object to roll down an incline. -Friction is in the same direction as an object's motion. -The magnitude of static friction is constant

Which of the following is NOT true about friction forces? Select the correct answer. If an object is moving across a surface in the +x direction and gravity is in the -y direction, and you apply an external pushing force in the -y direction, this would decrease the magnitude of the kinetic friction force. All of the statements are true. When an object is sliding on an inclined surface, the kinetic friction force is always parallel to the surface. Rougher surfaces will usually result in higher friction coefficients. When an object moving on a surface experiences kinetic friction forces, the internal energy of the object+surface system increases. If there are no forces applied to an object, then the static friction force on it must be zero.

Timothy J.

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