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DO NOW

DO NOW . Take out your homework. Look at the items on the front desk… list them in order of what you think is the lightest and what you think is the heaviest. . Weight and Mass . Weight is a measure of the force of gravity on you. Changes with location (because gravity changes)

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DO NOW

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  1. DO NOW Take out your homework. Look at the items on the front desk… list them in order of what you think is the lightest and what you think is the heaviest.

  2. Weight and Mass • Weight is a measure of the force of gravity on you. • Changes with location (because gravity changes) • Mass is the measurement of the amount of matter in an object. • Does not change with location • Scientists would rather use mass to measure matter because it is more consistent.

  3. Units of Mass • To measure properties of matter scientists use the International System of Units (SI) • Measured in kilogram (kg) or gram(g)

  4. Volume • The amount of space that matter occupies is its volume. • Common units for volume are liter(L), milliliter(mL), and cubic centimeter (cm3). • 1 mL=1 cm3 • To calculate volume of a regularly shaped object we can multiply length x Width x Height

  5. Irregularly Shaped Objects • For an irregularly shaped object we can put liquid in a container and check the volume, drop the object in, and then find the volume of both the object and the water. • total volume-initial volume =volume of the object.

  6. Density • Relates the mass of an object to its volume • Density = mass/volume • Unit for density is g/cm3 • Density is a physical property of an object and can be used to identify unknown substances.

  7. Sinking or floating • You can predict whether objects will sink or float in water. • Water has a density of 1 g/cm3 • If an object has a density greater than 1 g/cm3 it will sink, if an object has a density less than 1 g/cm3 it will float.

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