8th grade Density/Buoyancy Review

The mass of matter per unit of volume is known as

• Buoyancy

• Density

• Weight

The upward force exerted by a fluid on an object submerged in the fluid is called

• Buoyancy

• Weight

• Density

• Archimedes' principle

The force exerted on an object by the gravity of Earth is called

• Buoyancy

• Density

• Archimedes' principle

• Weight

Tags

NGSS.MS-PS2-4

The idea that the buoyant force exerted on an object is equal to the weight of the fluid displaced by the object is known as

• Weight

• Archimedes' principle

• Density

• Mass

If a cube that has a mass of 10 grams and a volume of 15cm³ is placed in a glass of water. What is the density of the cube, and will the cube sink or float? (Choose 2 answers)

• Float

• Sink

• 0.7 g/cm³

• 1.5 g/cm³

A beaker is filled with 100ml of water. A rock is then placed into the beaker and the water level rises to 350ml. What is the volume of the rock?

• 900ml

• 250ml

• 65ml

• 350 ml

If an object is less dense than the fluid it is placed in, it will:

• sink

• float

• drift in the middle of the fluid

The density of an object equals its:

• mass divided by volume

• volume divided by mass

• mass times volume

• volume times mass

If an object with a density of 2.0 g/cm³ is placed in a fluid with a density of 1.9 g/cm³, the object will

• float

• sink

• drift in the middle of the fluid

An object that weighs 40 newtons in air weighs only 35 newtons when submerged in water. What is the buoyant force exerted by the water on the object?

• 5 N

• 35 N

• 40 N

• 85 N