Equilibrium of concurrent forces, static and kinetic friction, laws of friction, rolling friction - One Line Questions

1. Which scenario best illustrates the concept of limiting friction? — The maximum force you can apply before a stationary object starts sliding
2. Which of the following is an example of static friction? — A person pushing a wall that doesn't move
3. The force of friction between two surfaces in contact is: — Opposite to the direction of relative motion or tendency of relative motion
4. If a body is in equilibrium, the vector sum of all forces acting on it is: — Zero
5. The force of friction is proportional to the normal reaction force between the surfaces. This is: — True for both static and kinetic friction up to the limiting value of static friction
6. If the coefficient of static friction between two surfaces is 0.5, what is the maximum angle of inclination of a plane on which the surfaces can rest without sliding? — Approximately 26.57 degrees
7. If a body is in equilibrium, it can be: — At rest or moving with constant velocity
8. A block is at rest on an inclined plane. If the angle of inclination is gradually increased, the block will start to slide when the angle reaches a specific value. This value is related to: — Coefficient of static friction
9. Friction is a: — Non-conservative force
10. Consider a body at rest on a rough horizontal surface. If a horizontal force is applied that is less than the limiting friction, the frictional force is: — Equal to the applied force and is static friction.
11. When an object moves on a rough horizontal surface with a constant velocity, the net force acting on it is: — Zero
12. When a body is in equilibrium, the algebraic sum of the components of all forces along any direction is: — Zero
13. For concurrent forces acting on a body in equilibrium, the resultant of all these forces must be: — Zero
14. A block of mass 'm' is placed on a rough horizontal surface. If a horizontal force F is applied, and the block starts to move with acceleration 'a', then the force of kinetic friction is: — F - ma
15. Which law of friction states that the force of friction is independent of the area of contact between the surfaces? — First Law of Friction
16. Rolling friction is generally: — Less than kinetic friction
17. What is the direction of the force of static friction when an object is at rest and an external force is applied to cause a tendency of motion? — Opposite to the direction of the applied force
18. Which of the following is a method to reduce friction? — Using lubricants.
19. What is the primary characteristic of kinetic friction? — It acts when there is relative motion between surfaces.
20. Which of the following statements about the coefficient of friction is true? — It is a dimensionless quantity.
21. Which of the following statements best describes static friction? — It opposes the tendency of motion when an object is at rest.
22. The force of friction is often described as a 'self-adjusting' force. This property is characteristic of: — Static friction
23. Why is it easier to push a heavy box once it starts moving than to get it moving initially? — Static friction is greater than kinetic friction.
24. The reason why it is difficult to start moving a heavy object is that: — Static friction needs to be overcome.
25. The force required to overcome static friction is generally: — Equal to the limiting friction
26. What is the maximum value of static friction called? — Limiting friction
27. The coefficient of kinetic friction (μ_k) is defined as the ratio of: — Force of kinetic friction to the normal reaction
28. The force of friction depends on the nature of the surfaces in contact. This is reflected in the: — Coefficient of friction
29. Which of the following is a direct consequence of the laws of friction? — Friction provides grip and stability.
30. The condition for equilibrium of concurrent forces is often represented by Lami's Theorem, which states that if three concurrent forces P, Q, R acting on a body are in equilibrium, then: — P/sin(α) = Q/sin(β) = R/sin(γ)
31. When a body is in equilibrium under the influence of three concurrent forces, these forces must be: — Coplanar and their resultant must be zero
32. If the applied force exceeds the limiting friction, the object will: — Start to move
33. Which type of friction is responsible for the grip of tires on a road, allowing a car to accelerate and turn? — Static friction
34. Which type of friction arises when a body rolls over a surface? — Rolling friction
35. Consider a book resting on a table. If you push the book horizontally with a small force and it doesn't move, the friction acting on the book is: — Static friction
36. A car is moving on a road. The friction between the tires and the road is: — Kinetic friction
37. Friction that opposes the motion of an object through a fluid (like air or water) is called: — Fluid friction (or drag)
38. Consider a body placed on a rough horizontal surface. If a horizontal force is applied, and the body starts to move, the friction acting on it is: — Kinetic friction
39. If a body is sliding down a rough inclined plane, the friction acting on it is: — Kinetic friction
40. Which statement is true regarding the relationship between static and kinetic friction? — Static friction is always greater than kinetic friction.
41. What is the angle of static friction? — The angle of inclination at which a body starts to slide down.
42. If the angle of inclination of a rough plane is increased such that a body placed on it starts to slide, the angle of inclination is equal to: — The angle of static friction (or angle of repose)
43. When a body is in equilibrium, the net force acting on it is zero. This implies that: — All of the above
44. Which of the following is NOT a law of friction? — The force of friction depends on the velocity of the object.
45. If an object is at rest on a horizontal surface and a horizontal force is applied, but the object does not move, what can be concluded about the friction acting on it? — The friction is static friction and its magnitude is equal to the applied force.
46. Rolling friction is caused by: — The deformation of the rolling body and the surface.
47. The coefficient of friction depends on: — The nature of the surfaces in contact
48. What is the condition for an object to be in equilibrium under the action of concurrent forces? — The net force acting on the object is zero.
49. What is the condition for a body to be in equilibrium under the action of concurrent forces? — The resultant force is zero.
50. The coefficient of static friction (μ_s) is generally related to the coefficient of kinetic friction (μ_k) as: — μ_s > μ_k
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