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?
ANSWER:Speed is not related to energy in any way.
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?
ANSWER:when the ball is at its highest point
A book is at rest on a flat table. The book is pushed across the table, causing it to move and eventually come to rest again. How does the potential and kinetic energy change during this process?
Responses
ANSWER:The potential and kinetic energy will stay the same unless the book speeds up or slows down.
Which is a good description of potential energy?
ANSWER:stored energy
your welcome [:
Answers 1. and 3. are wrong.
1 and 3 are wrong
what are the correct 1's
1.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?
Answer for 1.Energy is converted from other forms, not created.
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?
Answer for 2.When the ball is at its highest point.
3.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?
Answer for 3.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.
3.Which is a good description of potential energy?
Answer for 4.Stored energy
Hope this helps:)
Thank you for your responses! I noticed a small error in the answer to the first question. The correct statement should read: "Speed is not the only factor determining energy, as energy is related to both an object's mass and its velocity."
Now, I'd like to further explain the reasoning behind each correct answer:
1. An object falling through the air and gaining speed does not create new energy. The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another. In this case, as the object falls, its potential energy (stored energy due to its position) decreases and is converted into kinetic energy (energy due to its motion). The total energy of the system (object + Earth) remains constant.
2. When the ball is at its highest point, its kinetic energy is the lowest. At this point, the ball has lost all its initial upward velocity and is momentarily at rest before starting its descent. Kinetic energy is directly proportional to an object's mass and the square of its velocity. As the ball slows down and changes direction, its velocity approaches zero and its kinetic energy decreases.
3. When the book is pushed across the table and eventually comes to rest again, the potential and kinetic energy will stay the same unless the book speeds up or slows down significantly. If there is no significant change in speed, then the potential energy (due to its position above the ground) and the kinetic energy (due to its motion) will remain constant. However, if the book is subjected to external forces that cause it to speed up or slow down, then the energy will change accordingly.
4. Potential energy is indeed the stored energy that an object possesses due to its position or configuration. It represents the capacity for doing work or creating changes in a system. Some examples of potential energy include gravitational potential energy, elastic potential energy, and chemical potential energy.
I hope this additional explanation helps! If you have any more questions, feel free to ask.