Podcast
Questions and Answers
Which of the following is the correct equation for mechanical energy?
Which of the following is the correct equation for mechanical energy?
- $ME = PE + KE$ (correct)
- $ME = PE / KE$
- $ME = PE - KE$
- $ME = PE \cdot KE$
According to the principle of conservation of mechanical energy, what happens to the mechanical energy of an isolated system subject only to conservative forces?
According to the principle of conservation of mechanical energy, what happens to the mechanical energy of an isolated system subject only to conservative forces?
- It increases
- It remains constant (correct)
- It is unpredictable
- It decreases
If an object moves in the opposite direction of a conservative net force, what happens to its potential energy?
If an object moves in the opposite direction of a conservative net force, what happens to its potential energy?
- It increases (correct)
- It is unpredictable
- It decreases
- It remains constant
If the speed (not the velocity) of an object changes, what happens to its kinetic energy?
If the speed (not the velocity) of an object changes, what happens to its kinetic energy?
In real systems, what type of forces are usually present that can cause a change in mechanical energy?
In real systems, what type of forces are usually present that can cause a change in mechanical energy?
Which of the following is an example of a nonconservative force?
Which of the following is an example of a nonconservative force?
In an elastic collision, what happens to the kinetic energy of the objects involved?
In an elastic collision, what happens to the kinetic energy of the objects involved?
Who discovered the equivalence between lost mechanical energy and an increase in temperature?
Who discovered the equivalence between lost mechanical energy and an increase in temperature?
What is the principle of conservation of mechanical energy?
What is the principle of conservation of mechanical energy?
What happens to the potential energy of an object if it moves in the opposite direction of a conservative net force?
What happens to the potential energy of an object if it moves in the opposite direction of a conservative net force?
