Unit 2 Lesson 1 Changes in Energy

Book I, Energy and Energy Transfer

What are the two categories of energy?

kinetic energy (energy of motion) and potential energy (stored energy)

What does the Law of Conservation of Energy say?

Energy cannot be created or destroyed. It is either transferred from one place to another or transformed from one type of energy to another.

What are the forms of kinetic energy?

thermal, sound, electromagnetic, and electrical energy

What are the forms of potential energy?

chemical, elastic, and gravitational energy

What happens when a moving object goes up a hill?

The KE of the object is converted into GPE

What happens when an object is brought back down to the ground?

The GPE of the object is converted into KE

Heat and thermal energy is always transferred from a ________ object, to a ________ object.

warmer, cooler

CPE in batteries are often transformed into _____________, which is then transformed into heat, light, sound, or motion.

electrical energy

Why is no machine 100% efficient?

energy is lost when the input energy is transformed into heat and sound

What are the energy transformations in a battery operated flashlight?

The CPE from the batteries is converted to electrical energy, which is then converted into heat and light energy.

What are the energy transformations in an electric blow dryer?

The electric energy is transferred into heat and kinetic energy.

What are LED light bulbs so much more efficient than the incandescent light bulb?

Incandescent light bulbs transform a portion of electrical energy into thermal energy into light.