A Ladder Leans Against a Wall

question 45

Multiple Choice

A ladder leans against a wall. If the ladder is not to slip, which one of the following must be true?

• A) The coefficient of friction between the ladder and the wall must not be zero
• B) The coefficient of friction between the ladder and the floor must not be zero
• C) Both A and B
• D) Either A or B
• E) Neither A nor B

---

Definitions:

Prefrontal Cortex

The part of the brain located at the front of the frontal lobe, involved in complex behaviors such as planning, decision making, and moderating social behavior.

Hippocampus

A major component of the brain in humans and other vertebrates, playing critical roles in the consolidation of information from short-term to long-term memory and in spatial memory that enables navigation.

Corpus Callosum

A thick band of nerve fibers that divides the cerebral cortex lobes into left and right hemispheres, facilitating communication between the two sides of the brain.

Thalamus

A structure in the brain that acts as a relay station for transmitting sensory and motor signals to the cerebral cortex.