If a Glass of Water Is on a Table with a Piece

question 28

Multiple Choice

If a glass of water is on a table with a piece of paper under it,it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly.This is because,with a quick pull:

• A)the force on the glass will be less.
• B)the momentum of the paper will be greater.
• C)the time for the pull will be less.
• D)the coefficient of kinetic friction will be less.

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Definitions:

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the epidermis and nervous system among others.

Germ Layer

One of the three primary layers of cells (ectoderm, mesoderm, endoderm) in the early embryo that develop into specific organ systems.

Nervous System

A complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating and controlling bodily functions.

Ectoderm

The outermost layer of cells in the developing embryo of an animal, giving rise to the skin and nervous system.