Consider a situation where you are playing air hockey with a friend. the table shoots small streams of air upward to keep the puck afloat and to minimize friction. when you barely tap the puck forward, it a. slows and stops. b. moves with a constant speed until hitting the other end. c. moves backward with an equal and opposite velocity. d. continues to accelerate.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.