A.4 Rigid body mechanics Quiz
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5 questions, one answer each
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1. A 50 N force acts perpendicular to a door at 0.80 m from the hinge. The torque is:
- A. 40 N m
- B. 62.5 N m
- C. 0 N m
- D. 20 N m
2. A wheel accelerates uniformly from rest at 2.0 rad s⁻². Its angular speed after 5.0 s is:
- A. 2.5 rad s⁻¹
- B. 10 rad s⁻¹
- C. 25 rad s⁻¹
- D. 0.40 rad s⁻¹
3. Two 1.0 kg point masses sit 0.50 m either side of an axis. The moment of inertia is:
- A. 0.25 kg m²
- B. 0.50 kg m²
- C. 1.0 kg m²
- D. 2.0 kg m²
4. A spinning body has no resultant torque acting and its moment of inertia halves. Its angular speed:
- A. Halves
- B. Stays the same
- C. Doubles
- D. Quadruples
5. A flywheel has I = 2.0 kg m² and ω = 10 rad s⁻¹. Its rotational kinetic energy is:
- A. 20 J
- B. 100 J
- C. 200 J
- D. 10 J