Equilibrium Questions

Equilibrium is a state of the body where no change in the motion of the body or internal energy changes with respect to time.

Equilibrium is classified as Dynamic and Static equilibrium.

The three types of equilibrium are stable, unstable and neutral.

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Important Equilibrium Questions with Answers

1. Is the body said to be in equilibrium if it experiences linear acceleration?

1. YES
2. NO

Answer: b) NO

Explanation: A body is said to be in equilibrium if it is not affected by angular acceleration or linear acceleration.

2. When the body is in equilibrium, the total amount of external force is _____.

1. 1
2. -1
3. 0
4. None of the options

Answer: c) 0

Explanation: The total force acting on the body in equilibrium is zero.

3. In a rigid body in equilibrium, the sum of the moments on the body is ______.

1. 1
2. -1
3. 0
4. None of the options

Answer: c) 0

Explanation: The sum of the moments on the body is 0 in a rigid body in equilibrium.

4. State true or false: If a rigid body is at equilibrium, then the forces are balanced.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: The forces are said to be balanced in a rigid body in equilibrium.

5. _______ equilibrium is a state where bodies are at rest.

1. Static
2. Dynamic

Answer: a) Static

Explanation: Static equilibrium acts on the body when it’s at rest.

6. A body that is in equilibrium while it persists in moving with a constant velocity is known as ______.

1. Static equilibrium
2. Dynamic equilibrium

Answer: b) Dynamic equilibrium

Explanation: Dynamic equilibrium is seen in the body in equilibrium that continues to move with a uniform velocity.

7. Which type of equilibrium is seen in a ball kept at the bottom of a hemisphere?

1. Unstable equilibrium
2. Stable equilibrium
3. Neutral equilibrium
4. None of the above

Answer: b) Stable equilibrium

Explanation: In a stable equilibrium, the object is displaced from its equilibrium position and then tends to move towards that equilibrium point.

8. What is unstable equilibrium?

If the body does not regain its original position when it experiences an external force, it is said to be in unstable equilibrium.

9. A body is in _____ if the object is slightly displaced and it stays in its new position.

1. Unstable equilibrium
2. Stable equilibrium
3. Neutral equilibrium
4. None of the options

Answer: c) Neutral equilibrium

Explanation: The object is said to be in neutral equilibrium; if the object is slightly displaced, it remains in its new position.

10. How is equilibrium classified?

Equilibrium is classified as stable equilibrium, unstable equilibrium, and neutral equilibrium.

Practice Questions

1. Define the equilibrium of a rigid body.
2. What is physical equilibrium?
3. Define the centre of gravity.
4. What would be the sum of all torques acting on the rigid body in equilibrium?
5. Does angular acceleration act on the rigid body in equilibrium?