Question detail
Work done and energy transfer scenario: air resistance changes until terminal velocity is reached. Which answer best addresses Energy transfer and braking and the objective to explain that braking often transfers energy to thermal stores in brakes and surroundings?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Work done and energy transfer
Question
- A. In the parachutist scenario, apply braking to explain that braking often transfers energy to thermal stores in brakes and surroundings while keeping scalar versus vector quantities separate.
- B. In the parachutist scenario, mix up scalar versus vector quantities and ignore braking.
- C. Use a general revision statement without applying Energy transfer and braking to the situation.
- D. Choose a different forces topic instead of explaining explain that braking often transfers energy to thermal stores in brakes and surroundings.
Answer
The correct answer is: In the parachutist scenario, apply braking to explain that braking often transfers energy to thermal stores in brakes and surroundings while keeping scalar versus vector quantities separate.
Explanation
The correct option is In the parachutist scenario, apply braking to explain that braking often transfers energy to thermal stores in brakes and surroundings while keeping scalar versus vector quantities separate.. It is correct because the scenario says air resistance changes until terminal velocity is reached, which must be interpreted through Energy transfer and braking. This directly supports the learning objective to explain that braking often transfers energy to thermal stores in brakes and surroundings. Use values 8, 14, and 16 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error scalar versus vector quantities.
Common mistake
Misunderstanding Energy Transfer in Braking
Students often confuse the energy transferred during braking with the total kinetic energy of the vehicle, failing to recognize that energy is dissipated as thermal energy in the brakes and surroundings.
To fix this, students should focus on the concept that braking forces do work on the vehicle, transferring energy from the kinetic energy store to thermal stores, and practice explaining this process clearly.
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