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Which energy conversion does a friction brake perform?

  • A.Kinetic energy into heat
  • B.Kinetic energy into potential energy, which is stored within the brake and released when the vehicle moves again
  • C.Heat into work
  • D.Kinetic energy into electrical energy, which is returned to the battery and used again during the next acceleration

Answer: A

The brake converts the kinetic energy of the vehicle into heat at the friction interface, and that heat must then be dissipated to the air. Regenerative braking recovers energy electrically instead, which is a different mechanism. Heat dissipation is the limiting factor in brake design. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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