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.
When the child is sliding down the slide, they are not in dynamic equilibrium. Dynamic equilibrium occurs when the forces acting on an object are balanced and the object is moving at a constant velocity. In this case, the child is accelerating downwards due to the force of gravity. The child will reach dynamic equilibrium when they reach a constant velocity and no longer accelerate. This will occur when the forces of gravity pulling them downwards and friction opposing their motion balance out.
so which one
The correct answer is: The child will not reach dynamic equilibrium.
Which statement correctly defines dynamic equilibrium? (1 point)
Responses
Forces acting on a object are balanced and the object stays in rest.
Forces acting on a object are balanced and the object stays in rest.
Forces acting on a object are unbalanced and the object stays in rest.
Forces acting on a object are unbalanced and the object stays in rest.
Forces acting on a object are balanced and the object stays in motion.
Forces acting on a object are balanced and the object stays in motion.
Forces acting on a object are unbalanced and the object stays in motion.
The correct answer is: Forces acting on an object are balanced and the object stays in motion.
While you push a box you begin to decrease the force you are exerting on the box. When will the box reach static equilibrium?(1 point)
Responses
When Fpush=Ffriction
When cap f sub p u s h is equal to cap f sub f r i c t i o n
When Fpush>Ffriction
When cap f sub p u s h is greater than cap f sub f r i c t i o n
When Fpush<Ffriction
When Fpush<Ffriction
The box will not reach static equilibrium.
The correct answer is: The box will not reach static equilibrium.
What is the fastest motion that can be measured in any frame of reference? (1 point)
Responses
300,000 km/s
300,000 km/s
186,000 m/s
186,000 m/s
300,000 m/s
300,000 m/s
186,000 km/s
The correct answer is: 300,000 km/s.
Two people are on a train that is moving at 10 m/s north. They are walking 1 m/s south relative to the train. Relative to the ground, their motion is 9 m/s north.
Why are we able to use these motions to describe the motion relative to the ground?
(1 point)
Responses
As long as the frame of reference is stationary, all motion can be described in this way.
As long as the frame of reference is stationary, all motion can be described in this way.
If one object is moving much slower than the speed of light, its speed can be added to that of another object.
If one object is moving much slower than the speed of light, its speed can be added to that of another object.
The motion of everything in the Universe besides light can be described in this way.
The motion of everything in the Universe besides light can be described in this way.
The people are moving much slower than the speed of light so the ground acts as a frame of reference.