Heat Transfer
What type of heat transfer occurs when two objects touch?
Conduction
What happens to most materials when they are heated:
Expand
Does a thermal insulator speed up or slow down thermal energy transfer?
Slows it Down
What do we call materials that transfer thermal energy easily?
Conductors
What form of energy do batteries store?
Chemical Energy
What type of heat transfer moves energy through liquids and gases by currents?
Convection
What happens to most materials when they cool:
Contract
Which keeps a drink cold longer: a paper cup or a thin metal cup?
Paper Cup
Is rubber usually a thermal conductor or a thermal insulator?
Thermal insulator
What must a circuit have for electrical current to flow?
A complete loop
What type of heat transfer travels through space by electromagnetic waves?
Radiation
When matter gains thermal energy, what happens to the motion of its particles?
The particles move faster (gain kinetic energy)
Insulators are materials that normally trap ________.
Air
Is copper a good thermal conductor or a thermal insulator?
Thermal conductor
What is a circuit called when its path is broken and current cannot flow?
Open circuit
A metal spoon gets hot when sitting in hot soup. What type of heat transfer occurs?
Conduction
A metal bridge gets longer on a hot day. How do engineers design the bridge to prevent damage?
Expansion Joints
Two cups start at the same temperature. One changes temperature more slowly. Which cup has better insulation?
The cup that changes temperature more slowly
A student places a material in a complete circuit, and the light bulb turns on. Is the material an electrical conductor or insulator?
Electrical conductor
In a simple series circuit, one bulb burns out. What happens to the other bulb?
It goes out.
Warm air rises a hot attic. What type of heat transfer is responsible for this?
Convection
A material cools what happens to the objects density?
A cooler must keep ice from melting. Should the cooler maximize or minimize thermal energy transfer?
Minimize
Why are metals good conductors of heat?
Particles are close together
In a parallel circuit, one bulb goes out, but another stays lit. Why?
They have separate paths for current.