A Boy Pulls a Wooden Box Along a Rough Horizontal

question 70

Multiple Choice

A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown. In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F_g is the magnitude of the force of gravity. Which of the following must be true?

• A) P = f and N = F_g
• B) P = f and N > F_g
• C) P > f and N < F_g
• D) P > f and N = F_g
• E) none of these

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Definitions:

Inelastic Demand

A market condition where the demand for a product does not change significantly with a change in its price.

Elastic Supply

A scenario in which the amount of a product available for sale markedly changes in response to its price adjustments.

Social Security Tax

A tax levied on both employers and employees to fund the Social Security program, which provides benefits to retirees, disabled workers, and survivors of deceased workers.

Withholding Rate

The percentage of an employee's income that an employer holds back for tax purposes before paying the employee.