L5 Mass Vs. Weight
What is mass?
Mass is how much of something there is.
What does the law of conservation of mass state?
The fact that matter does not go away.
What is volume?
How much space matter takes up.
What is density?
Density is defined as mass divided by volume.
What is buoyancy?
The ability to float.
What is weight?
Weight is how strongly something is pulled on by gravity.
What two laws make up the first law of thermodynamics?
Law of Conservation of Mass AND Law of Conservation of Energy
How do you find the volume of a solid figure with a regular shape (like a box)?
Length X width X height.
What is has more mass- a kilogram of lead or a kilogram of feathers?
Both are the same- a kilogram.
If something is buoyant, what does that tell you about its density compared to that of the substance in which it floats?
It means that the object's density is less than the density of the substance that it is floating on.
What does a slug measure?
Mass
How is the mass of water changed when it turns to ice?
What is the meniscus?
The bottom of the curve in a graduated cylinder.
If an object floats in one liquid but sinks in another, what does that tell you about the densities of the two liquids?
The first liquid is denser than the second.
What is a substance that is buoyant in water besides you?
Oil, paper, leaf, etc.
What are the two units for measuring weight in the English system?
Pound and Ounce
Describe how conservation of mass occurs in plants.
Plants absorb nutrients; plant dies; nutrients return to the soil.
Explain the displacement method.
Object is placed in a graduated cylinder; however many milliliters the water rises is the volume.
If two substances with the same volume have different densities, how can you tell which one is the densest?
The one that is heavier will be more dense.
Why is it important to life that ice is less dense than water?
Otherwise rivers and lakes would freeze from the bottom up, and no life could survive in them.
What is the metric system unit for weight?
Newton
If you start with 10 grams of water and you boil it until there is no water left in the pan, what happened to the water?
The water turned into 10 grams of steam.
Why does the ping-pong ball have a lower density than the golf ball?
It is filled with air.
How are buoyancy and density related?
One substance is buoyant in another if it is less dense than the other substance.