A 20-N Force Acts Horizontally on a 10-N Block That Is

question 12

Multiple Choice

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.
-Suppose that the block now moves across the surface with constant speed under the action of a horizontal 3.0-N force. Which one of the following statements concerning this situation is false?

• A)The block is not accelerated.
• B)The net force on the block is zero newtons.
• C)The frictional force on the block has magnitude 3.0 N.
• D)The coefficient of kinetic friction between the block and the surface is 0.30.
• E)The direction of the total force that the surface exerts on the block is vertically upward.

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Definitions:

Genes

Segments of DNA that code for specific traits or functions and are the basic physical and functional units of heredity.

Collection

An accumulation of objects or data gathered for study, comparison, or exhibition.

Naturalistic Fallacy

The (mistaken) idea that anything “natural” must be “good.”

Evolutionary Fallacy

The erroneous argument or assumption that every current trait or behavior of a species can be fully explained by its evolutionary utility or adaptation.