1) On which surface will a toy sled travel the furthest? 

carpet, polished wood, ice

2) On which surface will a toy sled travel the least distance? 

carpet, polished wood, ice

3) The stickier the surface, ... 

the greater the friction, the less the friction, the same level of friction

4) Which of the following is an example of trying to increase friction?

squirting oil into door hinges, spreading grit on icy roads, waxing the underneath of skis