Heat Happens
What type of heat transfer happens through direct contact?
Conduction
How are particles arranged in a solid?
Tightly packed in fixed positions
When does an object float in a fluid?
When it is less dense than the fluid.
What is pressure equal to?
Force ÷ Area
What system is used in dental drills?
Pneumatic system
What type of heat transfer occurs through movement in fluids?
Convection
What happens to particle motion as temperature increases?
It increases.
What is the formula for density?
Mass ÷ Volume
What happens to pressure as volume decreases?
It increases.
Why does warm air rise?
It is less dense.
How does heat from the Sun reach Earth?
Radiation
Which state of matter has particles that move freely and spread out?
Gas
What happens when an object is more dense than water?
It sinks
What happens to pressure if the same force is applied over a smaller area?
Pressure increases
What type of heat transfer occurs in boiling water?
Convection
Why does metal feel colder than wood at the same temperature?
Metal is a better conductor of heat.
Why do gases expand when heated?
Particles move faster and spread farther apart
Why can large ships float in water?
Buoyancy due to displacement of water
Why do divers feel more pressure underwater?
More fluid above them exerts force
Why do winter jackets trap heat effectively?
Air pockets act as insulators.
Why does a spoon left in hot soup become hot?
Heat is transferred by conduction from the soup to the spoon.
How does particle movement differ between liquids and gases?
Liquids move past each other but stay close; gases move freely and far apart.
Why does a steel ship float but a steel ball sink?
The ship has a lower overall density because of the air inside.
Why are dams thicker at the bottom than at the top?
Pressure increases with depth
Why does a hot air balloon rise?
Heated air becomes less dense and rises.