Phase Changes
What do we call it when water turns into ice?
Freezing
What kind of force makes things slow down when they slide?
friction
What kind of energy helps us hear sounds?
sound energy
What kind of change happens when snow turns into water?
melting
Why do we feel warm when we stand in sunlight?
The Sun gives off light and heat energy, which travel to Earth and warm our skin.
What happens to water when we heat it up?
It turns into water vapor or steam.
What force pulls everything toward the ground?
Gravity
what is energy
The ability to make things move or change.
What happens if you heat ice cubes for a long time?
They melt into water, then turn into steam.
How does energy change when you turn on a lamp?
Electrical energy changes into light and heat energy.
What causes ice to melt faster — warm air or cold air?
warm air
When you throw a ball up, what force pulls it back down?
gravity
What kind of energy makes a toy car move when you push it?
mechanical energy
When you see your breath on a cold morning, what two phase changes are happening?
Water vapor from your breath condenses into tiny droplets, and sometimes freezes into ice crystals.
Why does a stretched rubber band have potential energy?
Because energy is stored in it and can be released when it snaps or moves.
What happens to steam when it cools down?
It turns back into water.
What kind of force does a magnet use to stick to the fridge?
magnetic force
What kind of energy comes from the Sun?
light energy
What happens to the movement of particles when a gas turns into a liquid?
The particles slow down and move closer together.
How do plants use the Sun’s energy?
They use light energy to make food during photosynthesis.
Why does your cold drink sometimes get drops of water on the outside?
Because warm air turns into water on the cold surface (condensation).
What happens when two magnets with opposite sides (poles) face each other?
they pull together or attract
What kind of energy do you get when you rub your hands together?
heat energy
When water boils, what happens to the energy in the water molecules?
They gain energy and move faster until they escape as gas.
When you rub your hands together, what two types of energy are involved?
Motion (mechanical) energy turns into heat energy due to friction.