O Levels Physics (5054)•5054/11/M/J/25

Explanation
Centripetal force direction in uniform circular motion
Steps:
- The truck moves at constant speed in a vertical circle, indicating uniform circular motion.
- Uniform circular motion requires centripetal acceleration directed toward the circle's center.
- The resultant force equals mass times centripetal acceleration, so it points toward the center.
- Arrow D aligns with this inward radial direction at the truck's position.
Why D is correct:
- Newton's second law (F_net = m v²/r) requires the net force to act toward the center for circular motion.
Why the others are wrong:
- A points upward (gravity direction), ignoring centripetal requirement.
- B points downward or tangential, which would cause linear or decelerating motion.
- C points radially outward, opposing the needed centripetal force.
Final answer: D
Topic: Circular motion
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