Exam-style question
Try this first
Why is it necessary for a car to have a centripetal force when turning around a curve? Scenario focus: use thermal physics in a distinct A-Level Physics context and identify the relevant physical quantity before choosing the answer.
- A.To increase its speed.
- B.To maintain a constant speed.
- C.To change its direction of motion.
- D.To decrease its mass.
Model answer
What a good answer should say
- To change its direction of motion.
Explanation
Why this works
The correct answer is To change its direction of motion.. This option is correct for Periodic motion because it applies the thermal physics idea in the stem and keeps the relevant quantity, unit, and physical conclusion together.
The alternatives either use a neighbouring formula, omit a required variable, or describe a different physical situation.
Common mistake
No common mistake is linked to this question yet.