Mechanical Energy
What two forms of energy make up mechanical energy?
a. thermal and electrical
b. chemical and electrical
c. kinetic and potential
d. kinetic and thermal
c. kinetic and potential
What is the definition of electrical energy?
a. the total kinetic energy of particles in matter
b. energy caused by motion of electric charges
c. energy can be released by a chemical reaction
d. energy carried as waves of vibrating matter
b. energy caused by motion of electric charges
Line travels in what direction?
A straight line
What is the definition of thermal energy?
a. the total kinetic energy of particles in matter
b. energy caused by motion of electric charges
c. energy can be released by a chemical reaction
d. energy carried as waves of vibrating matter
a. the total kinetic energy of particles in matter
What does the prefix hydro- mean?
a. air
b. water
c. sun
d. space
b. water
Which is an example of mechanical energy?
a. an oven
b. a flashlight
c. drums
d. a toy car
d. a toy car
What is NOT a good example of electrical energy?
a. desk lamp
b. an electric fan
c. child on a swing
d. toaster
c. child on a swing
What would happen to chocolate if you left it under a lamp for 30 minutes?
a. The chocolate would melt because it is soft.
b. The chocolate would melt because of the temperature of the room.
c. The chocolate would melt because the lamp produces light energy.
d. The chocolate would melt because the lamp produces light and heat energy.
d. The chocolate would melt because the lamp produces light and heat energy.
True of false. The air on a summer day in Florida has very little thermal energy.
False
When you have a question you want to answer by performing an experiment, what is your next step?
a. analyze evidence
b. draw a conclusion
c. plan an experiment
d. communicate results
c. plan an experiment
True of False. For something to have mechanical energy, it must be able to move.
True
Which is an example of electrical energy?
a. an oven
b. a flashlight
c. drums
d. a toy car
a. an oven
What causes a pencil to look broken when it's placed in a glass full of water?
a. The glass vase reflects light
b. Light bends as it travels through water.
c. Light bends as it travels through glass.
d. The glass vase absorbs the light.
b. Light bends as it travels through water.
Other than thermal energy, what other kind of energy does a fire produce?
a. electrical
b. potential
c. light
d. sound
c. light
What statement about energy is correct?
a. Energy is not useful
b. Energy can cause motion or change
c. Energy is used up when it causes a change
d. Energy does not change forms
b. Energy can cause motion or change
What is the energy of motion called?
a. kinetic
b. potential
c. electrical
d. thermal
a. kinetic
True of false. Electrical energy can produce other forms of energy.
True
You feel hotter wearing a black shirt compared to wearing a white shirt. Why is this?
a. The white shirt does not absorb as much light as the black shirt, so its temperature is lower.
b. The black shirt does not absorb as much light as the white shirt, so its temperature is lower.
c. The color of the shirt does not affect how much light is absorbed, so you feel the same temperature.
d. The black shirt reflects all colors of light.
a. The white shirt does not absorb as much light as the black shirt, so its temperature is lower.
What are you creating when you rub your hands together?
a. reflection
b. friction
c. pitch
d. refration
b. friction
What kind of energy is stored in batteries?
a. light
b. heat
c. chemical
d. mechanical
c. chemical
What is NOT a good example of mechanical energy?
a. an electric fan
b. a desk lamp
c. a child on a swing
d. a person in a sailboat
b. a desk lamp
What is an example of electrical energy in this classroom?
lights, computers, the projector, the pencil sharpener....
What happens to light when it encounters a mirror?
a. It is bent by the mirror
b. It is reflected by the mirror
c. It is absorbed by the mirror
d. It continues traveling in a straight path.
b. It is reflected by the mirror
If you put lotion on your hands before you rub them together, how would this change what happens to the heat energy you produce?
a. The lotion would make your hands dry, so they would produce less heat.
b. The lotion would make your hands dry, so they would get even warmer.
c. The lotion would make your hands slippery, so they would produce less heat.
d. The lotion would make your hands slippery, so they would get even hotter.
c. The lotion would make your hands slippery, so they would produce less heat.
What determines the pitch of a sound?
a. The speed of the vibrations
b. The energy of the vibrations
c. The material the vibrations travel through
d. The shape of the vibrating object.
a. The speed of the vibrations