Grade 5 · Science · Unit 9 of 12
Forms of Energy
Energy changes form
What your child practises
Kinetic and potential energy, how energy changes from one form to another, and why some energy always escapes as heat, light or sound.
Ontario Curriculum expectation: E2.1–E2.4 · forms of energy, potential and kinetic energy, and the conservation of energy
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
You clap your hands and hear a sound. Kinetic energy changed into…
- sound energy
- chemical energy
- gravitational energy
Show answer
sound energy
Hint: The motion makes the air vibrate.
Question 2
A battery in a flashlight stores which form of energy?
- Kinetic energy
- Sound energy
- Chemical energy
Show answer
Chemical energy
Hint: Batteries store energy in chemicals.
Question 3
A wind-up toy stops after its spring unwinds. What happened to the spring's stored energy?
- It is still in the spring
- It disappeared
- It changed to motion, then to heat and sound
Show answer
It changed to motion, then to heat and sound
Hint: Stored energy changed form as the toy moved.
Question 4
Why do your hands feel warm after you rub them?
- Energy is created from nothing
- Friction changes motion into thermal energy
- The air gets colder
Show answer
Friction changes motion into thermal energy
Hint: Rubbing turns kinetic energy into heat.
Question 5
A speaker changes electrical energy into mostly…
- sound energy
- gravitational potential energy
- chemical energy
Show answer
sound energy
Hint: A speaker's cone vibrates and makes sound.
Question 6
An old-style light bulb gives off light and a lot of heat. What does the heat show?
- Energy was destroyed
- Some energy was not changed into the light we wanted
- Heat is a form of matter
Show answer
Some energy was not changed into the light we wanted
Hint: Some energy dissipates as heat into the surroundings.