A Freight Car Rolls Along a Horizontal Track at 12

question 221

Multiple Choice

A freight car rolls along a horizontal track at 12 m/s and hooks onto an identical freight car at rest. The coupled cars will

• A)come to a quick stop,
• B)roll at 3 m/s,
• C)roll at 6 mph,
• D)roll at 12 ms,
• Which makes sense because
• E)in the absence of external forces, trains in motion continue in motion.
• F)the acceleration of the car at rest equals the force of impact divided by the two masses.
• G)since twice the mass is moving, the speed will be half for the same momentum.
• H)energies before and after the collision remain the same.

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Definitions:

Implicit Memories

Memories that are formed and used unconsciously and can affect thoughts and behaviors without an individual's awareness.

Well-Learned Skills

Abilities or tasks that have been practiced to the extent that they can be performed with ease, often automatically.

Implicit Memory

A type of memory in which previous experiences aid the performance of a task without conscious awareness of these previous experiences.

Classically Conditioned

An educational method where two stimuli are consistently associated; initially, the second stimulus provokes a response, but over time, the response is triggered by the first stimulus alone.