Short Questions (120)
Easy (30%)
1. Define force.
2. What is meant by the center of mass?
3. How is a rigid body defined?
4. What is torque?
5. What is the line of action of a force?
6. Define the axis of rotation.
7. What is a moment arm?
8. State the principle of moments.
9. What do you understand by the center of gravity?
10. Define equilibrium.
11. What is meant by stable equilibrium?
12. What is an unstable equilibrium?
13. What is a neutral equilibrium?
14. Define couple in the context of physics.
15. What is meant by the resolution of a force?
16. Define parallel forces.
17. Differentiate between like and unlike parallel forces.
18. What is meant by the addition of forces?
19. What is a lamina?
20. How do you find the center of gravity of a regular shape?
21. What happens to the center of mass when a body is in equilibrium?
22. What are the conditions necessary for equilibrium?
23. State the first condition of equilibrium.
24. State the second condition of equilibrium.
25. What is meant by the Turing effect of force?
26. What is the relationship between stability and the center of mass?
27. What is the significance of the center of mass in daily life?
28. How does the position of the center of gravity affect stability?
29. What is a moment of a force?
30. Describe the concept of force with an example.
Moderate (40%)
1. Explain how to resolve a force into its perpendicular components.
2. Why is the principle of moments important in mechanics?
3. How can we determine the center of mass of an irregular-shaped object?
4. Explain the role of the axis of rotation in determining torque.
5. How does the line of action of a force affect its rotational effect?
6. Why does a couple produce rotation but not translation?
7. Describe an experiment to determine the center of gravity of a lamina.
8. Why are like parallel forces considered in the same direction?
9. How does the second condition of equilibrium relate to rotational forces?
10. How can we find the center of mass of a composite object?
11. Explain the difference between stable and unstable equilibrium with examples.
12. How does the position of the center of mass determine the stability of an object?
13. Explain how forces can be added using the vector method.
14. What is the significance of the moment arm in calculating torque?
15. Describe the importance of equilibrium in a mechanical system.
16. Explain how the principle of moments can be used to find unknown forces.
17. Why is torque called the turning effect of a force?
18. How does the first condition of equilibrium relate to linear forces?
19. Why is the center of gravity not always at the geometric center of an object?
20. Explain how an object can be in neutral equilibrium.
21. What are the units of torque?
22. Describe how a rigid body is different from a deformable body.
23. How can the center of gravity of a human body be determined?
24. Why is the stability of a vehicle dependent on the position of its center of mass?
25. How can forces be combined to determine the net effect?
26. Describe the role of the moment arm in determining torque.
27. Explain the significance of couples in mechanical systems.
28. How does the center of gravity change when mass is added to an object?
29. How is equilibrium maintained in a suspended object?
30. Describe how rotational forces can cause instability in an object.
31. What happens when a force is applied away from the center of gravity?
32. Why are experimental methods used to find the center of gravity?
33. Explain why an object falls when its center of mass is not supported.
34. How does an object maintain equilibrium on an inclined plane?
35. Describe the stability of an object when its center of gravity is lowered.
36. How is a body affected when forces are not in equilibrium?
37. How can we calculate the torque if the force and moment arm are known?
38. Why are rigid bodies considered ideal for analyzing rotational motion?
39. Explain the concept of force couple with an example.
40. What is the effect of a couple on a rigid body?
Tough (30%)
1. How do you mathematically express the principle of moments?
2. Describe the concept of torque in terms of rotational motion.
3. How can the center of mass of a non-uniform object be determined analytically?
4. Explain how forces can be resolved into two components using trigonometry.
5. Describe the significance of the second condition of equilibrium in mechanical systems.
6. Explain how torque varies with the angle of the applied force.
7. Why does an object in unstable equilibrium fall?
8. How can the center of gravity be used to determine an object’s tendency to topple?
9. Describe an experiment to determine the stability of an object.
10. Explain the role of the moment arm in producing rotational motion.
11. How does the principle of moments apply to complex systems like cranes?
12. Describe the concept of neutral equilibrium using examples.
13. How is the center of mass used in balancing complex mechanical systems?
14. Explain the mathematical relationship between force, moment arm, and torque.
15. Why is the position of the center of gravity crucial in designing structures?
16. How does the application of torque affect the equilibrium state of an object?
17. Describe how forces are added geometrically using the parallelogram law.
18. Explain why an object in stable equilibrium returns to its original position.
19. Why is it challenging to maintain equilibrium in an irregularly shaped body?
20. Describe the effect of torque in terms of angular acceleration.
21. Explain how the principle of moments is used to design bridges.
22. Why does the position of the axis of rotation affect the turning effect of a force?
23. How does an increase in the moment arm affect torque?
24. Explain why the center of gravity must be known to predict the behavior of rotating bodies.
25. Describe how couples are used in steering mechanisms.
26. Explain why the center of gravity is not always fixed in a body.
27. How can equilibrium conditions be applied to solve complex mechanical problems?
28. Why do forces at different angles produce varying torques?
29. Describe the role of the moment arm in lever systems.
30. How can mathematical principles be applied to determine forces in a complex system?
Long Questions (10)
Easy (30%)
1. Describe in detail the principle of moments with examples. Explain how it is used to find unknown forces in a system.
2. Discuss the concept of equilibrium and the conditions necessary to achieve equilibrium. Provide examples from daily life.
3. What are the differences between stable, unstable, and neutral equilibrium? Explain with diagrams and examples.
Moderate (40%)
4. Explain the process of determining the center of gravity for irregular-shaped bodies using both experimental and analytical methods.
5. How do parallel forces affect the equilibrium of a body? Discuss the role of like and unlike parallel forces in maintaining equilibrium.
6. Describe the concept of torque in detail, along with its mathematical expression. Provide real-life applications and examples.
Tough (30%)
7. Discuss how torque is influenced by the position and direction of the applied force. Provide a mathematical explanation and examples.
8. Explain the significance of the second condition of equilibrium in rotational systems. Provide a detailed analysis with solved examples.
9. How does the position of the center of mass influence the stability of an object? Discuss the relationship with various states of equilibrium.
10. Describe the factors affecting the stability of an object and the role of the center of mass and center of gravity. Discuss in detail with mathematical expressions and diagrams.