M2_Science_Revision [Density, Buoyancy,Force,Speed,Velocity]

What is the formula for density?

• D = m + v

• D = m - v

• D = m/v

• D = v/m

Which of the following describes buoyancy?

• the ability of an object to float

• the force that causes an object to sink

• the density of an object

• the mass of an object

If an object has a mass of 20 kg and a volume of 4 m³, what is its density?

• 5 kg/m³

• 8 kg/m³

• 15 kg/m³

• 20 kg/m³

An object will float in water if:

• its density is greater than water

• its mass is equal to its volume

• its density is less than water

• its volume is greater than its mass

Which is easier to lift and why?

• A, because buoyant force lifts it upward

• B, because the buoyant force pulls it downward

• B, because gravity pushes it downward

• A, because gravity pushes it upward

Why does the ball float on water?

• Because the buoyant force is greater than the weight

• Because the weight is greater than the buoyant force

• Because the weight and buoyant force are equal

• The ball likes to float

Which condition causes an object to float?

• lower mass and higher buoyant force

• lower buoyant force and higher mass

• higher mass and higher buoyant force

• None of the above

A material with a density of 7.8 g/cm³ is placed in water. What will happen? [Density of water = 1.00 g/cm3]

• it will float

• it will sink

• it will dissolve

• it will boil

Density of an object is affected by ___ and __

• mass/volume

• mass/gravity

• mass/height

• volume/height

What is the unit of density?

• g/m³

• kg/m²

• kg/m³

• kg/m