Question

target reading skill using prior knowledge review your graphic organizer and revise it based on what you just learned in the section. reviewing key concepts 1. a. defining what is energy? b. describing how are energy, work, and power related? c. applying concepts if a handsaw does the same amount of work on a log as a chainsaw does, which has a greater power? why? 2. a. identifying what is kinetic energy? what is potential energy?

Explanation:

1. a. Energy is the ability to do work or cause change.

• It can exist in various forms like kinetic, potential, etc.

1. b. Work is done when a force causes an object to move. Power is the rate at which work is done. Energy is transferred when work is done. For example, when you lift a book, you do work on it, and energy is transferred to the book in the form of potential energy. Power is related as it shows how quickly that work - energy transfer occurs.
2. c. The chainsaw has greater power. Power is work divided by time ($P=\frac{W}{t}$). If both saws do the same amount of work ($W$) but the chainsaw does it in less time ($t$) (because it is more efficient and faster), then according to the power formula, its power ($P$) is greater.
3. a. Kinetic energy is the energy of motion. An object in motion, like a moving car, has kinetic energy. Potential energy is stored energy due to an object's position or state. For example, a book on a high shelf has gravitational potential energy because of its height above the ground.

Answer:

1. a. Energy is the ability to do work or cause change.
2. b. Work is done when a force causes an object to move, energy is transferred during work - done, and power is the rate of doing work.
3. c. The chainsaw has greater power because power is work divided by time and it does the same work in less time.
4. a. Kinetic energy is the energy of motion; potential energy is stored energy due to position or state.