Energy Around Us
Where do humans and animals get the energy they need to move, work, and grow?
From the food (Chemical Energy) they eat
A glowing flashlight is left turned on until the battery dies and the light goes out. Which statement best explains what happened to the energy?
A) The energy was destroyed.
B) It turned into light and heat energy.
C) It disappeared into the plastic case.
D) The flashlight ran out of air.
B) It turned into light and heat energy.
A hot cup of tea is left on a kitchen table. After one hour, the tea becomes cold. What happened to the heat energy?
The heat energy spreads out through the air.
Why do all living things, including humans and plants, need a continuous supply of energy?
Living things need energy for all life processes, including growth, repair, and movement.
Which pair of energy forms does the Sun constantly send to Earth?
Light Energy and Heat (Thermal) Energy
A child winds up a toy robot and lets it walk across a table. As it moves, the robot makes a loud clicking sound. How did the stored energy change?
A) Stored energy → Kinetic + Sound energy
B) Stored energy → Electrical + Light energy
C) Stored energy → Heat energy only
D) Sound energy → Stored energy
A) Stored energy → Kinetic + Sound energy
When a loud airplane flies overhead, you can hear it from inside your house. How does the sound energy reach your ears?
Sound energy travels by spreading out through the air.
Where do plants get the energy they need to make their own food?
From sunlight. Plant are producers.
Which item clearly demonstrates movement energy in everyday life?
A. An unlit candle sitting on a desk
B. A bicycle wheel turning fast
C. A kite flying high in the wind
D. A wind-up toy walking across a table
B. A bicycle wheel turning fast
When you rub your hands together quickly on a cold day, they begin to feel warm. Where did your movement (kinetic) energy go?
A) It turned into chemical energy.
B) It changed into light energy.
C) It was completely destroyed.
D) It changed into heat energy.
D) It changed into heat energy.
Look at this word diagram for an electric kitchen fan. Which option correctly fills in the missing energy form?
Electrical Energy ➡ ______ Energy + Sound Energy
movement (kinetic) energy
A food chain contains a rabbit that only eats grass. What is the correct role for this rabbit?
Consumer ➡ Herbivore
When an alarm clock rings in the morning, it produces sound energy. Name two other everyday appliances or items that make sound energy when turned on.
Doorbell, blender, hair dryer, vacuum cleaner...
A television transforms electrical energy into useful light and sound. What is the wasted form of energy that warms up the back of the TV?
A) Chemical energy
B) Magnetic energy
C) Thermal (heat) energy
D) Kinetic energy
C) Thermal (heat) energy
When a heavy drum is hit with a drumstick, the drum skin vibrates. What is the correct energy change that takes place?
Movement → Sound
Look at this food chain diagram. What do the arrows show?
Grass → Grasshopper → Frog
The direction that energy moves.
It shows the flow of energy.
A battery-powered toy car stops moving after playing with it for a long time. Why does the toy car stop? Explain what happened to its energy.
the battery ran out of stored energy
A bouncy ball is dropped and bounces a few times, getting lower each time until it stops. What happened to its kinetic energy?
A) The energy disappeared into nothing.
B) It changed into sound and heat energy.
C) The ball turned it into light energy.
D) The floor destroyed the energy.
B) It changed into sound and heat energy.
A working washing machine cleans clothes by spinning, but it also buzzes loudly and feels warm. This means energy is spreading into the environment as:
Sound + Heat
Earthworms and mushrooms break down dead leaves and plants, returning nutrients back to the soil. What role do they play?
Decomposers