Which of the following is an example of an electric force acting at a distance? A.
Pam rubs a glass rod with wool, then moves the rod over a pile of small paper scraps. The scraps leap into the air and stick to the rod.
B.
Pam applies a force to the head of a nail by pounding it with a heavy, iron hammer. The nail then wedges itself between the fibers of a wooden board.
C.
Pam applies a twisting force to the steering wheel of her car. This force pushes on tubes filled with fluid, which then push the wheels of her car to one side.
D.
Pam jumps out of an airplane. Air rushes past her body at
a very high speed as she falls. She then opens her parachute and feels an upward force.