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:

General Adaptation Syndrome

A three-stage response (alarm, resistance, exhaustion) that the body has to long-term exposure to stress, proposed by Hans Selye.

Posttraumatic Stress Disorder

A psychiatric disorder that can occur in people who have experienced or witnessed a traumatic event, characterized by severe anxiety, flashbacks, and uncontrollable thoughts about the event.

General Adaptation Syndrome

A three-stage response (alarm, resistance, exhaustion) that the body goes through in reaction to prolonged stress.

Distress

Emotional suffering or pain often caused by stress, anxiety, or trauma, which can negatively impact an individual's mental and physical health.