Building an energy-converting device

Question 1

Which device would best let you test a design that changes stored chemical energy into motion?

Accepted Answer

a battery‑powered toy car

Answer

a wind turbine that spins in the breeze

Answer

a solar‑powered calculator

Answer

a flashlight that uses batteries

Question 2

Lily built a simple circuit that uses a battery, two wires, and a small light bulb. She wants the bulb to shine brighter. Which of the following changes is most likely to make the bulb brighter?

Accepted Answer

Replace the battery with one that has a higher voltage

Answer

Use a longer piece of wire in the circuit

Answer

Insert a piece of rubber between the battery and a wire

Answer

Use a larger light bulb

Question 3

Sam is building a simple launcher that uses a stretched rubber band to launch a paper airplane. He wants to design, test, and refine his device so it changes the stored (potential) energy in the rubber band into kinetic energy that makes the airplane fly farther. Which of the following actions would be the best way for Sam to test his device and decide how to improve it?

Accepted Answer

Measure the distance the airplane travels after each launch.

Answer

Write a short story about the airplane’s flight.

Answer

Count how many times he stretches the rubber band before each launch.

Answer

Paint the airplane a different color to see if it looks nicer.

Try three questions

Which device would best let you test a design that changes stored chemical energy into motion?

Lily built a simple circuit that uses a battery, two wires, and a small light bulb. She wants the bulb to shine brighter. Which of the following changes is most likely to make the bulb brighter?

Keep going on this shelf