Properties of Fluids

If an object sinks in a fluid, _____.

• the density of the fluid is greater than the density of the object
• the density of the fluid is less than the density of the object
• the density of the fluid is equal to the density of the object
• density has nothing to do with whether an object sinks or floats, only which state of matter the object is

The term fluids generally applies to:

• solid and liquid

• liquid and gas

• solid and plasma

• water only

These statements are about the particle model of matter. Which one is not correct?

• Liquids are hard to compress because their particles are very close together

• Gases expand to fill their container because there are only weak forces between the particles

• Liquids can flow because there are only very weak forces between the particles

• Solids have a fixed shape because there are very strong forces between the particles

Tags

NGSS.MS-PS1-4

Why do solids expand when they are heated?

• The particles get bigger

• The particles vibrate more and take up more space

• The particles vibrate more and get closer together

• The particles stick together

Tags

NGSS.MS-PS1-4

Buoyant force acts in the ________________ of gravity, making things feel lighter

• same direction

• opposite direction

which of the following statements is true?

• oil floats on water because oil is less dense than water
• oil does not float on water because water is more dense
• water floats on oil because water is less dense

Density formula

• Density= mass*volume

• Density=volume/mass

• Density= mass + volume

• Density= mass/volume

An object has a mass of 15 grams and a volume of 12 cm3. What is the density of this object?

• 2.63 g/cm3

• 1.25 g/cm3

• 0.865 g/cm3

• 0.579 g/cm3

A rubber duck has a mass of 4.3 grams and a volume of 11 mL. What is the density of the rubber duck?

• 2.56 g/mL

• 0.87 g/mL

• 0.391 g/mL

• 1.05 g/mL

Calculate the density to two decimal places

Volume: 300 cm3

Mass: 800 g

Mathematical Equivalence

ON

Answer explanation

Remember when you are rounding you need to look at the digit that comes next and use it to determine if your number rounds up or stays the same.

ex: 1.234 - 4 is lower than 5 so you round to 1.23 (3 stays the same)

1.456 - 6 is higher than 5 so you round to 1.46 (5 goes up to 6)