What is Density?
What two things do you need to measure to find density?
Answer: Mass and volume
What is the formula for pressure?
Answer: Pressure equals Force divided by Area P=F/A
When you dive deeper into a pool, does the water pressure increase or decrease?
Answer: It increases
Is a kilogram of feathers or a kilogram of lead heavier?
Answer: Neither, they weigh the same!
What is the main unit for density?
Answer:g/cm3 or kg/m3
What is the unit of pressure called?
Answer: The Pascal Pa
What upward force keeps things floating in water?
Answer: Buoyant force
What instrument is used to measure air pressure?
Answer: A barometer
If an object has a mass of 10 g and a volume of 2cm3, what is its density?
Answer: 5 g/cm3
If you push with a small area, does the pressure go up or down?
Answer: It goes up
If an object is less dense than water, will it float or sink?
Answer: Float
On which side should a heavy box rest on the floor to make the least pressure?
Answer: On its largest side
Does oil float on water or sink?
Answer: Float, because it is less dense than water
Why are skis wide?
Answer: To increase surface area and decrease pressure so you don't sink in snow
Who is famous for shouting "Eureka!" while taking a bath and discovering buoyancy?
Answer: Archimedes
What state of matter has a fixed volume but takes the shape of its container (liquids or gases)?
Answer: Liquids
Why does a solid iron nail sink in water?
Answer: Because iron is denser than water
If you double the force on an object, what happens to the pressure?
Answer: It doubles
Why does a heavy ship float?
Answer: Because it is hollow and filled with air, making its average density less than water
Why do your ears "pop" when you go up in a fast elevator or airplane?
Answer: Because the air pressure outside changes faster than the pressure inside your ears