MYP Physics · 05 · multiple choice
What changes kinetic energy most?
Work, energy and power · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 3
- Topics
- 2
- Answer
- Complete
multiple choice3 marks
Two identical scooters travel on the same path. Scooter B moves at twice the speed of Scooter A. How does B's kinetic energy compare with A's?
- a
Select and explain Select the correct comparison and explain it using the kinetic-energy relationship.
3 marks
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Answer overviewCorrect answer: C — It is four times as large.
01
3 marksa
Select and explain Select the correct comparison and explain it using the kinetic-energy relationship.
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
Selects option C: scooter B has four times the kinetic energy.
- 2
States or uses Eₖ = ½mv².
- 3
Explains that doubling v multiplies v², and therefore Eₖ, by four while mass is unchanged.
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