*Question*
Choose between "water" and "air". Question: Mythbusters checked the resistance of a bullet. When they fired it, they found that there is higher friction in (A) Air (B) Water.
**Answer**
air

*Question*
Choose between "hot pan" and "placemat". Question: Harry learned that a hot pan has lower resistance then a placement when he was sliding an ice cube across different surfaces. The ice cube moved faster across the (A) hot pan (B) placemat
**Answer**
hot pan

*Question*
Choose between "rubble" and "sand". Question: Mike's bulldozer creeps along slowly on rubble, but speeds along quickly on sand. This means that _____ is rougher (A) rubble (B) sand
**Answer**
sand

*Question*
Choose between "gym floor" and "grass". Question: Jeremy is playing with a basketball in the gym. He rolls it across the gym floor to the equipment room and it easily rolls in. Later he is playing outside with the basketball with a friend. He rolls it across the grass, but it seems like it doesn't want to go over the rough surface. The basketball will generate less heat when it is rolled across the (A) gym floor (B) grass.
**Answer**
gym floor