Question

density simulation phet
name:

1. define the following: mass:

volume:
density:

1. density is a property of matter that can be calculated by dividing the mass of the substance by its volume. write this as a mathematical equation:
2. open up the density simulator and click \intro.\ the substance that the simulation begins with is wood, which appears to be in a tank of water. describe everything you notice about the wood. (dont touch any of the controls just yet.)
3. fill in the information:

mass of wood	volume of wood

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1. using the equation from above, calculate the density of the wood. (the units will be kg/l.)
2. move either the mass or volume control to a different number. record the information below:

mass of wood	volume of wood

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1. again, use your equation and calculate the density. dont forget to include the units!
2. switch the substance to brick. describe everything that you notice about the brick.
3. record the mass and volume of the brick in the table below. use the equation to calculate the density. then, change the mass and volume, record those results and calculate the density. repeat that one more time.

mass of brick	volume of brick	density of brick

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Explanation:

Step1: Define mass

Mass is the amount of matter in an object.

Step2: Define volume

Volume is the amount of space an object occupies.

Step3: Define density

Density is mass per unit volume of a substance.

Step4: Write density - mass - volume equation

The mathematical equation for density $
ho$ is $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume.

Step5: Observe wood in simulation

In the simulation, the wood is floating on the water surface. This indicates that the density of wood is less than the density of water.

Step6 - 7: Calculate wood density (assume values from simulation)

Suppose the mass of wood $m_{wood}=0.5$ kg and volume $V_{wood}=1$ L. Then, using the density formula $
ho_{wood}=\frac{m_{wood}}{V_{wood}}=\frac{0.5\text{ kg}}{1\text{ L}} = 0.5$ kg/L.

Step8: Observe brick in simulation

The brick sinks in the water, which means the density of the brick is greater than the density of water.

Step9: Calculate brick density (assume values from simulation)

Suppose the mass of brick $m_{brick}=2$ kg and volume $V_{brick}=1$ L. Then, $
ho_{brick}=\frac{m_{brick}}{V_{brick}}=\frac{2\text{ kg}}{1\text{ L}}=2$ kg/L.

Answer:

1. Mass: The amount of matter in an object.

Volume: The amount of space an object occupies.
Density: Mass per unit volume of a substance.

1. $

ho=\frac{m}{V}$

1. The wood is floating on the water surface.

4 - 7: (Values depend on simulation, e.g., if $m = 0.5$ kg and $V = 1$ L, density is 0.5 kg/L)

1. The brick sinks in the water.
2. (Values depend on simulation, e.g., if $m = 2$ kg and $V = 1$ L, density is 2 kg/L)