Science Review 5.6A--Category 2

How are sound energy and light energy the same?

• Both sound and light can be absorbed.

• Both sound and light are found deep within the earth's surface.

• Both sound and light are created through vibrations.

• Both sound and light travel in a straight line.

People use thermal energy everyday. All of the following are examples of how thermal energy is used except---

• Warm air from a hair dryer causes water to evaporate from wet hair.

• Popcorn seeds are placed in a popcorn maker until they pop out of their hard shells.

• Pancake batter is placed in a skillet on a stove to make pancakes.

• An electric guitar is connected to an amplifier to make the guitar louder.

Which of the following is an example of mechanical energy?

• Cooking food in a microwave.

• The spinning of a wind turbine.

• Using a battery in a remote control.

• The sound of wind chimes on a windy day.

Which forms of energy does a camp fire produce?

• Light energy and electrical energy.

• Light energy and mechanical energy.

• Thermal energy and mechanical energy.

• Thermal energy and light energy.

All of the following are examples of how light energy is used in everyday life EXCEPT---

• A laser is used to read bar codes in a supermarket.

• A street light comes on when it gets dark.

• A plant is grown indoors using a special lamp.

• A microwave pops a bag of popcorn.

Which form of energy do you need to power a computer?

• You need thermal energy because the computer gets hot when it runs.

• You need light energy because the computer screen produces a lit display.

• You need electrical energy because the computer uses an electrical current.

• You need mechanical energy because the computer contains moving parts.

Which part of a flashlight transforms electrical energy into energy that you can see?

• Batteries

• Wires

• Light bulb

• Power switch

A campfire, fireworks, and a burning candle all produce--

• Mechanical and thermal energy

• Light and sound energy

• Light and thermal energy

• Sound and electrical energy

5.6 A When a bat searches for prey at night, it makes sounds as it flies, and it uses the sounds’ echoes to find its prey. When the bat flies and listens to echoes to locate prey, it is using —

• thermal energy and light energy

• sound energy and thermal energy

• mechanical energy and sound energy

• light energy and mechanical energy

A student made a list of activities that involve energy.

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1. Sharks chasing a school of fish

2. A toaster heating bread

3. A cell phone charging

4. A tree limb falling to the ground

5. Tomato plants absorbing sunlight

6. A canoe floating down a river

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Which activities on the list are examples of the use of mechanical energy?

• Activities 1, 4, and 6

• Activities 2, 4, and 5

• Activities 1 and 2

• Activities 3, 5, and 6