On being displaced, the centre of mass of unstable equilibrium goes?
A.
Higher
B.
Neither higher nor lower
C.
First higher and then lower
D.
Lower
Answer: Option D
Explanation:
A body is said to be in unstable equilibrium if it gets further displaced from its equilibrium position after being slightly displaced and released. In unstable equilibrium, a body possesses maximum potential energy and its centre of mass goes lower on being slightly displaced.
Which of the following stays in equilibrium even after being slightly displaced?
A.
Stable equilibrium
B.
Unstable equilibrium
C.
Neutral equilibrium
D.
Rigid body
Answer: Option C
Explanation:
If a body stays in equilibrium position even after being slightly displaced and released, it is said to be in neutral equilibrium. When a body is slightly displaced, its centre of mass is neither raised nor lowered and its potential energy remains constant.
The flying wheel attached to the shaft of steam engine works on the principle of?
A.
Centripetal action
B.
Moment of inertia
C.
Newton’s third law of motion
D.
Conservation of momentum
Answer: Option B
Explanation:
A flywheel is attached to the shaft of an engine. Because of its large moment of inertia, the flywheel opposes the sudden increase or decrease in the speed of the vehicle. It allows a gradual change in the speed and prevents jerky motions and hence ensures a smooth ride for the passengers.