9. Work & Energy

Which of the following processes would require an input of energy?

When a speeding truck is moving before hitting a wall, what type of energy is associated with its motion?

Which of the following best describes the main energy conversions that occur when a car moves down the street?

Which of the following scenarios best illustrates $\mathrm{kinetic} \mathrm{energy}$ being converted into $\mathrm{potential} \mathrm{energy}$?

Which of the following are the two main types of energy commonly discussed in introductory physics?

Which process in stars is primarily responsible for the formation of elements in the universe?

What type of energy can be stored until it is needed to do work?

Which of the following is an example of $\mathrm{work}$ being done on an object?

Which statement best describes the relationship between the $\mathrm{potential energy}$ and $\mathrm{kinetic energy}$ of an object in a closed system?

Which of the following devices is designed to convert energy into mechanical work?

Which two forms of mechanical energy are commonly discussed in introductory physics?

Which of the following is considered an efficient storage of energy?

When comparing the values of gravitational potential energy ($\mathrm{GPE}$) and kinetic energy ($\mathrm{KE}$) for an object in free fall (neglecting air resistance), what do you observe, and which physical law does this illustrate?

In the context of energy transfer in ecosystems, what does the $10\%$ rule refer to, and why is energy lost at each trophic level?

In a mass-spring system oscillating horizontally on a frictionless surface, at which position is the potential energy stored in the spring being converted most rapidly into kinetic energy?