Question

Question

An object falls through the air, gaining speed as it falls. A student claims that this creates new energy, and so it breaks the law of conservation of energy. Which statement describes why the student is incorrect?(1 point)
Responses

Energy is converted from other forms, not created.
Energy is converted from other forms, not created.

Equal and opposite amounts of other energy are also created.
Equal and opposite amounts of other energy are also created.

Speed is not related to energy in any way.
Speed is not related to energy in any way.

Energy can be created without breaking the law of conservation of energy.

Answer 1

The correct statement is:

Energy is converted from other forms, not created.

This response accurately explains that as the object falls, its potential energy is converted into kinetic energy. The total energy remains constant, adhering to the law of conservation of energy.

Answer 2

A person throws a ball up into the air, and the ball falls back toward Earth. At which point would the kinetic energy be the lowest?(1 point)
Responses

when the ball leaves the person’s hand
when the ball leaves the person’s hand

at a point when the ball is still rising
at a point when the ball is still rising

at a point before the ball hits the ground
at a point before the ball hits the ground

when the ball is at its highest point
when the ball is at its highest point

Answer 3

The correct response is:

when the ball is at its highest point.

At this point, the ball's kinetic energy is at its lowest because it comes to a momentary stop before falling back down. All of the kinetic energy has been converted to potential energy at this point.

Answer 4

A book is at rest on a flat table. A person gives the book a shove and it slides across the table. The book eventually comes to rest again near the edge of the table. How does the potential and kinetic energy change during this process?(1 point)
Responses

The potential stays the same since the book is on the table. The kinetic energy stays the same since the book was only shoved.
The potential stays the same since the book is on the table. The kinetic energy stays the same since the book was only shoved.

The potential energy will stay the same as long as the book stays on the table. The kinetic energy increases when the book is shoved and then gradually decreases as it slides across the table and then comes to rest on the edge.
The potential energy will stay the same as long as the book stays on the table. The kinetic energy increases when the book is shoved and then gradually decreases as it slides across the table and then comes to rest on the edge.

The potential energy increases as the book is pushed across the table. The kinetic energy stays the same since the book was shoved.
The potential energy increases as the book is pushed across the table. The kinetic energy stays the same since the book was shoved.

The potential and kinetic energy are the same while the book is sitting on the table. They both increase when the book is shoved and then decrease as the book comes to rest again.

Answer 5

The correct response is:

The potential energy will stay the same as long as the book stays on the table. The kinetic energy increases when the book is shoved and then gradually decreases as it slides across the table and then comes to rest on the edge.

This accurately describes how the potential energy remains constant while the book is on the table. The kinetic energy increases when the book is shoved and then decreases as friction slows it down and it comes to rest.