You Are Standing in a Moving Bus,facing Forward,when You Suddenly

question 45

Multiple Choice

You are standing in a moving bus,facing forward,when you suddenly slide forward as the bus comes to an immediate stop.What force caused you to slide forward from the point of view of the observer on the ground?

• A)the force that Earth exerts on you
• B)the force exerted by the floor of the bus on you perpendicular to the floor
• C)the force exerted by the floor of the bus parallel to the floor (the friction force)
• D)There is not a force causing you to your fall.

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Definitions:

Hemoglobin

A protein in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.

Enzymes

Biological molecules that act as catalysts to speed up chemical reactions in living organisms without being consumed in the process.

Proteins

Large, complex molecules that play many critical roles in the body, including catalyzing metabolic reactions, DNA replication, and responding to stimuli.

Pica

A compulsive eating disorder of non-nutritive substances like dirt or paper, often seen in children and pregnant women.