Question

A child is on a playground they start to slide down a large slide. At what point is the child in dynamic equilibrium with the slide?(1 point)
Responses

When the child pushes themselves down the slides.
When the child pushes themselves down the slides.

As the child is in motion as they are sliding down.
As the child is in motion as they are sliding down.

When the slide ends and the child has stopped moving .
When the slide ends and the child has stopped moving .

The child will not reach dynamic equilibrium.
The child will not reach dynamic equilibrium.

Answer 1

Dynamic equilibrium means the child is moving with constant velocity (net force = 0). So the child is in dynamic equilibrium only while sliding at constant speed — i.e. when the downslope component of gravity is exactly balanced by friction/air resistance. If they are accelerating they are not in dynamic equilibrium; when they stop at the end that's static equilibrium.