Mini-Quiz: Reducing Sliding Friction

1. What happens when you apply a lubricant?

   The coefficient of friction increases because the lubricant holds back motionSorry, not correct. Try another button. The coefficient of friction decreases due to fluid frictionThat is correct. You are a champion in knowing friction. The coefficient of friction becomes zeroGood try, but not right. Select another answer.

2. How can rollers reduce friction?

   The rollers spin at a high speedSorry, not correct. Try another button. No one is really sure, because it is too hard to measureOops! Wrong answer. Re-read the question and try again. You are replacing sliding friction with rolling frictionCorrect. You are doing great!

3. What happens when you pull slightly upward on a rope as you slide an object along the floor?

   The upward pull reduces the normal force and thus reduces the frictionThat is correct. You are a champion in knowing friction. The upward pull pivots the object against the floor, making it harder to pullGood try, but not right. Select another answer. The object will tip overOops! Wrong answer. Re-read the question and try again.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.