Alex places 2 cubes side-by-side on a ramp made of wood. Cube #1 is ice and Cube #2 is wood wrapped with sandpaper. The cubes are the same size and the same mass and are placed at the
same height on the ramp. When Alex released the two cubes, the ice cube slid down the ramp, but
the sandpaper cube did not move. What accounts for this difference?
The sandpaper block did not move because the forces of friction and gravity were balanced.
The ice cube moved because the forces of friction and gravity were balanced.
The sandpaper block did not move because the forces of friction and gravity were unbalanced.
The ice cube moved because the ice and ramp did not produce any friction which resulted in balance.