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Q: Which of the following occurs as a result of surface irregularities between two surfaces?
  • A. friction
  • B. impulse
  • C. stress
  • D. force torque
Correct Answer: Option A - Friction occurs as a result of surface irregularities between two surfaces. This friction is parallel to the contact planes of the bodies. The force of friction acts in the opposite direction of motion of the body.
A. Friction occurs as a result of surface irregularities between two surfaces. This friction is parallel to the contact planes of the bodies. The force of friction acts in the opposite direction of motion of the body.

Explanations:

Friction occurs as a result of surface irregularities between two surfaces. This friction is parallel to the contact planes of the bodies. The force of friction acts in the opposite direction of motion of the body.