Question

state at which point during oscillation the oscillator has zero velocity but positive acceleration​

Answer 1

Answer:

mean position

Explanation:

I think the answer is normal or mean position.

Answer 2

Answer:

homework-and-exercises forces kinematics work spring

Explanation:-

Imagine a block (of mass m) attached to a spring (of spring constant k) that is hanging from a fixed support on the ceiling. The spring is initially in its relaxed state( no compression or extension). At this moment velocity of the block is zero

When I release the spring from rest, the force due to gravity and the force due to spring(restoring force) are the two forces acting on the block.

According to me,when:

magnitude of Force due to gravity> magnitude of Restoring force, then the velocity of the body increases.

magnitude of Force due to gravity=magnitude of Restoring force, then the acceleration of the body is zero, and the body has maximum constant velocity.

magnitude of Force due to gravity < magnitude of Force of the spring, then the velocity of the body decreases until it stops.

However when the spring reaches maximum extension, there is still negative accelaration, but the velocity of the body is zero.

[ I used work-energy theorem to calculate maximum extension as 2mgk, and therefore, force due to spring = 2mg,

force due to gravity= mg,

and net force = force due to spring- force do to gravity=mg]

If there is a net upward force, then there is also an acceleration, but the velocity is zero. How is this posible??