Q. Which of the following statements is/are correct for friction?

1. It acts along two surfaces in contact.
2. It opposes motion.

Select the correct answer from the codes given below:
Answer: Both 1 and 2
Notes: According to the Newton’s first law of motion a body continues to be in its state of rest or of uniform motion in a straight line unless an external force acts on it. But every object stops after some motion with a force of friction. The force acting along the two surfaces in contact which opposes motion of one body over other is called the force of friction.