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Which of the following statements about a body under equilibrium is/are correct ?
1. No forces are acting.
2. A number of parallel forces may be acting.
3. The law of moments must apply.
Select the correct answer using the code given below :
Explanation
A body is said to be in mechanical equilibrium when both the net external force and the net external torque acting on it are zero.
- Statement 1 is incorrect: It is not necessary that "no forces" act on the body. Multiple forces can act simultaneously as long as their vector sum (resultant force) is zero.
- Statement 2 is correct: A body can be in equilibrium even if several parallel forces act on it, provided they cancel each other out and produce no net torque.
- Statement 3 is correct: For a body to be in rotational equilibrium, the Law of Moments must apply, which states that the algebraic sum of moments of all forces acting on the body about any point must be zero (or the sum of clockwise moments equals the sum of anticlockwise moments).
SIMILAR QUESTIONS
A body is at rest on the surface of the earth. Which one among the following statements is correct regarding this?
Two forces of equal magnitude simultaneously act at a point. It is observed that the resultant force is equal in magnitude to the individual forces. Which of the following statements is/are correct?
I. The angle between one of the individual forces and the resultant force is π/3.
II. The angle between the individual forces is 2Ï€/3.
Select the answer using the code given below.