Energy: Forms and Transfer — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. When a hot pan warms your hand, energy moves by direct contact between the two objects.
In Grade 4 Science, energy that moves through touching objects is transferred by contact, also called conduction.
2. Energy from the Sun reaches Earth as light waves that travel through space.
Grade 4 learners study how the Sun sends energy across empty space as light and other waves.
3. Energy that flows through a wire from a battery is called an electric current.
In Grade 4 Science, an electric current carries electrical energy from a power source to a device through wires.
4. When metal touches metal and heat moves between them, this transfer is called conduction.
Grade 4 students learn that conduction is the main way heat travels through metals and other solids.
5. Sound energy travels from a drum to your ear as a wave.
In Grade 4 Science, sound energy moves from one place to another as a vibration wave through air.
6. A circuit must form a complete loop for electrical energy to flow.
Grade 4 learners study how electricity needs an unbroken path to keep moving through a circuit.
7. When you rub your hands together quickly, friction transfers motion energy into heat energy.
Grade 4 Science shows that friction between surfaces turns some motion energy into thermal energy.
8. A wave that carries energy through water without moving the water far is called a water wave.
In Grade 4 Science, water waves carry energy across the surface even though the water itself stays in place.
9. Energy can be transferred but it cannot be destroyed, only changed in form.
Grade 4 students begin learning that the total amount of energy stays the same; it only changes form or place.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Hot pan warming your hand
→ Transfer by contact (conduction)
Transfer by contact (conduction)
Sun heating the Earth
→ Transfer by light waves (radiation)
Transfer by light waves (radiation)
Battery lighting a bulb
→ Transfer by electric current
Transfer by electric current
Drum sending sound to your ear
→ Transfer by sound waves
Transfer by sound waves
Grade 4 Science groups energy transfers into contact, waves, and electric currents, and each example fits one of those three ideas.