6. What is a force that works against motion?
B. friction
C. gravity
D. motion
7. Which has the greatest friction?
A. polished floor C. tiled floor
B. sandy floor D. wet floor
8. Which surface creates more friction?
A. magnetic surface Crough surface
B. slippery surface D. shiny surface
9. Which has the least amount of friction?
А. carpet
B. concrete С. ice
D. grass
10. A parachute helps a parachutist land safely on the ground or water
by
A reducing air resistance that speeds up its motion
B. reduces air resistance that slows down its motion
C. increasing air resistance that speeds up its motion
D. increasing air resistance that slow down its motion​