A Boy Pulls a Wooden Box Along a Rough Horizontal

question 21

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:

Relatively Price Inelastic

A situation where the demand for a product changes by a smaller percentage than changes in price, indicating that consumers are less responsive to price changes.

Price Elasticity

A metric for evaluating how variations in the price of a commodity impact its demand level.

Unity

The state of being united or joined as a whole, often used in various contexts to denote harmony and agreement among members of a group or between entities.

Coefficient of Price Elasticity

The coefficient of price elasticity measures how much the quantity demanded of a good or service changes in response to a change in its price, indicating its price sensitivity.