Grade 12 Physics Examination Questions (MCQ) : Force & Motion
Taught by Staff Reporter
Mastering the fundamental concepts of Force and Motion through targeted practice—such as answering the 20 multiple-choice questions below—gives high school students in Papua New Guinea a significant advantage in their national physics examinations. These questions align closely with the PNG National Examination syllabus, reinforcing key principles like Newton’s Laws, friction, weight, acceleration, and net force—topics that frequently appear in both the Grade 10 and Grade 12 exams. By regularly engaging with exam-style questions, students not only build confidence and improve problem-solving speed but also develop a deeper conceptual understanding essential for scoring well.
Strong performance in physics opens pathways to tertiary education in fields such as engineering, health sciences, and technology—critical sectors for PNG’s national development. Therefore, consistent practice with relevant, curriculum-based questions is a proven strategy for academic success and future opportunity. Taking the questions may help students in their pursuit in success in Physics National Exams.
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1. Which of the following best defines force?
2. What is the SI unit of force?
3. According to Newton’s First Law of Motion, an object at rest will remain at rest unless:
4. What is the acceleration of a car that increases its speed from 10 m/s to 30 m/s in 5 seconds?
5. If a net force of 20 N is applied to a 4 kg object, what is its acceleration?
6. Which of the following is an example of balanced forces?
7. What is the weight of a 10 kg object on Earth? (Use g = 10 m/s²)
8. Friction is a force that:
9. Which law states that “for every action, there is an equal and opposite reaction”?
10. If two forces of 5 N and 3 N act in the same direction on an object, what is the net force?
11. What happens to the acceleration of an object if the net force acting on it doubles (mass remains constant)?
12. Which of the following is NOT a type of force?
13. An object moves with constant velocity. What can you say about the net force acting on it?
14. What is the momentum of a 2 kg object moving at 3 m/s?
15. In which situation is inertia most noticeable?
16. If you push a wall with a force of 50 N, what force does the wall exert on you?
17. Which of the following reduces friction?
18. What is the resultant force when two forces of 10 N and 6 N act in opposite directions?
19. Which of the following best describes motion?
20. A student drops a stone from a cliff. Ignoring air resistance, what causes the stone to accelerate downward?
