Forms of Energy
A drum makes a sound when it is hit. What causes the sound?
The drum vibrates and transfers energy to the surrounding air.
What are two things energy can cause?
Motion and change.
What happens when two negatively charged objects are brought close together?
They repel each other.
What must a circuit have for electricity to flow?
A complete, closed path.
What is a hypothesis?
A testable idea or prediction about what might happen in an experiment.
Which form of energy is stored in the food you eat?
Chemical energy.
What type of energy makes a toaster heat up?
Thermal energy (heat).
What happens when a positively charged object comes near a negatively charged object?
They attract each other.
What happens when a switch opens an electric circuit?
The flow of electricity stops, and the light bulb turns off.
Why should scientists repeat an experiment more than once?
To check whether the results are consistent and reliable.
A toy car uses a tightly wound spring to move. What type of energy was stored in the spring before it was released?
Stored mechanical energy. (potential energy.)
Why does an ice cube melt when placed near a heat lamp?
It absorbs thermal energy, causing it to change from a solid to a liquid.
Can a charged object attract a neutral object?
Yes. A charged object can cause charges in a neutral object to shift, creating an attraction.
Name one material that conducts electricity well and one material that is an insulator.
Copper conducts electricity; rubber is an insulator. (answers vary)
A student discovers that adding more wire coils around an iron nail makes an electromagnet stronger. What does the student write to explain what the results show?
A conclusion.