A Brick Initially Has Its Largest-Area Face in Contact with a Rough

question 12

Multiple Choice

A brick initially has its largest-area face in contact with a rough surface,as shown on the left in the figure.A force F is required to pull the brick along the surface at constant speed. The brick is now flipped so that a face of smaller area is in contact,as on the right in the figure.The material of the brick is uniform on all faces.What force is now required to pull the brick along at constant speed as before?

• A)a smaller force
• B)the same force
• C)a greater force
• D)One cannot say without knowing the coefficient of friction.

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Definitions:

Insects

A class of arthropods, characterized by a three-part body (head, thorax, abdomen), three pairs of legs, compound eyes, and two antennae.

Arthropod

An invertebrate that belongs to phylum Arthropoda; characterized by a hard exoskeleton; a segmented body; and paired, jointed appendages.

Parapodia

Paired, lateral extensions found in some annelids, such as polychaete worms, used for locomotion and respiration.

Oligochaetes

A subclass of earthworms characterized by having few bristles per segment, important for soil aeration and nutrient cycling.