Which of the following is an example of increasing friction
A. Adding grease gears on a bike
B. Waxing skis
C. Oiling a squeaky door
D. Throwing sand on an icy driveway
D. Throwing sand on an icy driveway
This is an example of increasing friction because the sand provides more traction on the slippery surface, making it less slick and reducing the risk of slipping. In contrast, options A, B, and C describe actions to reduce friction.