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 Speed is not related to energy in any way. Speed is not related to energy in any way. Energy is converted from other forms, not created. Energy is converted from other forms, not created. Energy can be created without breaking the law of conservation of energy. Energy can be created without breaking the law of conservation of energy. Equal and opposite amounts of other energy are also created.

Answer 1

The correct statement that describes why the student is incorrect is: Energy is converted from other forms, not created.

When an object falls through the air, the potential energy it had due to its height is converted into kinetic energy as it gains speed. No new energy is created; rather, energy is transformed from one form to another, in accordance with 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 is at its highest point when the ball is at its highest point when the ball leaves the person’s hand when the ball leaves the person’s hand at a point before the ball hits the ground at a point before the ball hits the ground at a point when the ball is still rising

Answer 3

The correct response is: when the ball is at its highest point.

At the highest point of its trajectory, the ball has momentarily stopped moving upward before it starts falling back down, which means its kinetic energy (the energy of motion) is at its lowest (essentially zero) at that moment. All the energy at that point is potential energy due to its height.

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

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.

While the book is on the table, its potential energy remains constant because its height above the surface does not change. When the person shoves the book, its kinetic energy increases, and as it slides across the table, friction and other forces will cause the kinetic energy to gradually decrease until it comes to rest again.

Answer 6

Which is a good description of potential energy?(1 point) Responses stored energy stored energy conserved energy conserved energy energy of reaction energy of reaction energy of motion

Answer 7

The correct response is: stored energy.

Potential energy is often described as stored energy because it is energy that an object has due to its position or condition, which has the potential to be converted into other forms of energy (such as kinetic energy) when the object's position or condition changes.

Answer 8

A student drops a basketball into a pool from a height of 5 meters while a friend records the approximate splash height. They want to make a bigger splash in their next trial. How can they achieve this?(1 point) Responses They can drop the same ball with less speed. They can drop the same ball with less speed. They can use a ball with the same diameter but less mass. They can use a ball with the same diameter but less mass. They can use a ball with the same diameter but more mass. They can use a ball with the same diameter but more mass. They can drop the same ball from a lower height.

Answer 9

The correct response is: They can use a ball with the same diameter but more mass.

Using a ball with more mass will increase the kinetic energy of the ball when it hits the water, resulting in a bigger splash upon impact. The height from which the ball is dropped (5 meters in this case) also contributes to the splash, but increasing the mass of the ball while keeping the size constant is likely to create a more significant splash.

Answer 10

Which characteristic will be affected by increasing the speed of an object from 30 meters per second ( ms ) to 40 meters per second( ms )?(1 point) Responses kinetic energy kinetic energy weight weight gravitational attraction gravitational attraction mass

Answer 11

The correct response is: kinetic energy.

Kinetic energy is given by the formula \( KE = \frac{1}{2} mv^2 \), where \( m \) is the mass of the object and \( v \) is its speed. Increasing the speed of the object from 30 m/s to 40 m/s will significantly increase its kinetic energy due to the squared relationship with speed.