Particles and Matter Liquids and Gases Forces: Gravity Simple Machines Heat Energy
Particles
What are tiny pieces of matter called?
to freeze
What does it mean to lose heat energy?
gravity
______ is a force that pulls everything down to the earth.
tools that make it easier for people to do work
What are simple machines?
Heat energy
_________ is energy that makes things feel warm.
Mass
_______ is how many particles are in something.
changes from solid to liquid
What does it mean to gain heat energy?
weight
More mass = more _________
1. Lever and fulcrum
2. ramp
3. wheel and axle
4. pulley
Name the four types of simple machines
fire, blankets, lights
What are some sources of heat?
Volume
_________ is how much space something takes up.
evaporation
______ is when water changes to gas and floats up into the air.
friction
_______ is a force that makes everything slow down and stop
a bar balanced on a point. We use them to lift heavy things, or as a scale.
What is a lever? Why do we use them?
wood, coal, and oil
Name three fuels we use for heat
Density
_______ is how close together the particles are.
condense
________ is when water changes from a gas back to a liquid, and falls down toward earth.
rough
What makes more friction? A smooth surface or a rough surface?
We use them to move heavy things up. It can be flat or stairs.
What do ramps look like? Why do we use them?
faster
When something has more heat energy, the particles are moving (faster/slower).
Sink goes under water, float means lay on top.
What do sink and float mean?
vapor
Another word for liquids turning into a gas
to help us move without falling
Why is friction important?
doorknobs, pencil sharpeners, wheels on car/bus
Name a wheel and axle you use everyday.
Conductors let heat move easily through them. One conductor is metal. We use metal to cook things on the stove.
Insulators do not let heat pass through easily. Such as rubber mittens when cooking so we do not burn ourselves on the hot metal.
What are conductors and insulators? Give an example of each.