Physics - Fluids and Gravity - Mr. K

Fluids are defined as ...

• a nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas or a liquid

• a solid state of matter in which the atoms or molecules are free to move past each other, as in a gas or a liquid

• a nonsolid state of matter in which the atoms or molecules are unable to move past each other, as in a gas or a liquid

• a nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a solid

If the actual weight of an object (in air) is 4 N, and the apparent weight of an object (in water) is 2 N, then what is the Buoyant Force?

• 8 N

• 4 N

• 2 N

• 1/2 N

Fluids can also be described as ​ (a)  

• anything that flows
• anything that cannot flow
• sometimes able to flow
• a semi-solid

These have a definite volume, but no definite shape.

• liquids

• solids

• semi-solids

• gases

The concentration of the matter of an object is called ​ (a)  

• mass density
• volume
• contraction
• matter concentration

Density depends on ​ (a)   and pressure.

• temperature
• buoyancy
• latitude
• altitude

The SI units for mass density is ​ (a)  

• kg/m3
• g/cm3
• kg/m2
• N*m2

Mass Density =

• mass / volume

• volume / mass

• force / volume

• mass / force

The upward force exerted by a fluid on an object is called ...

• buoyant force

• normal force

• gravitational force

• sinking force

True or False. Buoyant force is opposite the force of gravity.

• True

• False