What is mass?

​Mass is the amount of matter in an object.

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What tool do we use to measure​ mass?

​We use a pan balance.

​How do we know when a balance is even?

Units of mass

​What are some things we can use to find the mass of something?

paperclips, pencils, soda can, markers...

​Jellybeans, dinkies, _______

​We can use the mass of 2 objects to compare them. For example we can use paperclips to estimate the mass of a pencil.

Some things are better to use to find mass.

Subject | Subject

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• mass of a dog, better to use paper clips or jug of water?

• mass of car, better to use jellybeans or bikes?

• mass of sandwich, better use dimes or paint cans?

The mass of a cell phone is about

• ​1 glass of water

• 2 bananas

• 5 hotdogs​

We can estimate (guess) the mass of something using the mass of something we already know.

because each thing has a different mass

​Why are the numbers different?

We can order things by their mass

Put these items in order from least to greatest mass.

• Bike, pencil, book

• Person, truck, paper

• Apple, eagle, bear​

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Name 3 things in order from least mass to greatest mass