Question: To tear aluminum foil from roll,
Options:
pull a piece out with your hand to it's desired length, and then pull the piece down sharply over the box's teeth.
pull a piece out with your hand to it's desired length, and then pull the piece up sharply over the box's teeth.
Answer: pull a piece out with your hand to it's desired length, and then pull the piece down sharply over the box's teeth.