Energy: Forms and Transfer — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A battery-powered toy car rolls across the floor. Which energy chain best describes what happens?
A) Chemical to electrical to motion energy
B) Light to sound to heat energy
C) Sound to chemical to electrical energy
D) Heat to light to chemical energy
In Grade 4 Science, battery toys store chemical energy that becomes electrical energy in wires and then motion energy at the wheels.
2. When a hairdryer is turned on, what two forms of energy come out of it?
A) Chemical and light
B) Motion and heat
C) Sound and chemical
D) Light and chemical
Grade 4 students learn that hairdryers change electrical energy into both motion energy in the fan and heat energy in the coil.
3. A child stretches a rubber band and then lets it go to launch a small paper ball. Which transformation is happening when the band snaps back?
A) Light energy to sound energy
B) Heat energy to chemical energy
C) Potential energy to kinetic energy
D) Electrical energy to potential energy
In Grade 4 Science, stretched rubber bands store potential energy that turns into kinetic energy when they snap back.
4. A flashlight is turned on in a dark room. Which energy change happens first inside the flashlight?
A) Light energy changes into electrical energy
B) Chemical energy in the battery changes into electrical energy
C) Sound energy changes into light energy
D) Heat energy changes into chemical energy
Grade 4 learners study how flashlight batteries first turn chemical energy into electrical energy, which then becomes light in the bulb.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A windmill turns wind's motion energy into electrical energy that powers homes.
In Grade 4 Science, windmills change kinetic energy from moving air into electrical energy through generators.
2. When a moving ball slows down because of friction, much of its kinetic energy is changed into heat energy.
Grade 4 students learn that friction turns motion energy into thermal energy, which spreads to nearby objects.
3. A solar panel changes light energy from the Sun into electrical energy.
In Grade 4 Science, solar panels turn light energy from the Sun into electrical energy for homes and devices.
4. A microwave oven uses electrical energy to make food gain heat energy so it warms up.
Grade 4 learners see that microwaves transfer energy to food, which is shown as a rise in heat or thermal energy.
5. Energy is never made or destroyed; it is only transformed from one form to another.
Grade 4 Science introduces the conservation of energy, where energy only changes form rather than being created or lost.