Kinetic friction (box in motion) 9. How does the direction of kinetic friction compare to the the direction of the static friction? 10. How does the magnitude of kinetic friction change as you increase the push? 11. How does the value of the net force change as you increase the push? 12. Adjust the push to a value equal to kinetic friction. What is the net force? 13. Which term(s) best describes the velocity in question 12? 14. While the box is moving, stop applying the force, what happens to the velocity of the box? [2 Forces ' 8 Sum of Forces El Values [3' Masses 8 Speed Frlctlon Kinetic Friction To a first approximation, a block sliding on a surface experiences a frictional force that is independent of its speed and also is proportional to the normal force. That is, f k = Hk '1 where in is the coefficient of kinetic friction. Typically, pk