Mini-Quiz: External Force and Sliding Kinetic Friction

1. What happens if you keep the same external force used to start the object sliding?

   No one is sure, since it never has been triedGood try, but not right. Select another answer. You cannot keep the same external forceSorry, not correct. Try another button. The object acceleratesThat is correct. You understand about external forces.

2. How do you an object to slide at a constant velocity?

   Make the external force from pushing equal to the kinetic sliding friction forceCorrect. You know about friction. Stop pushing the objectOops! Wrong answer. Re-read the question and try again. Push as hard as you canSorry, not correct. Try another button.

3. When does a moving object stop?

   When the external force is greater than the friction forceOops! Wrong answer. Re-read the question and try again. When its velocity is zeroThat is correct. You understand about external forces. When the external force equals the friction forceGood try, but not right. Select another answer.

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