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Macedonia > Physics > Flashcards

Physics Flashcards

1
Q

What is the formula for calculating density?

A

Density = Mass / Volume

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2
Q

True or False: Density is a scalar quantity.

A

True

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3
Q

What is the SI unit of density?

A

Kilograms per cubic meter (kg/m³)

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4
Q

Fill in the blank: The density of water is approximately _____ kg/m³.

A

1000

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5
Q

What happens to the density of a substance when it is heated?

A

It generally decreases.

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6
Q

What is pressure defined as?

A

Pressure = Force / Area

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7
Q

Which unit is commonly used for measuring pressure?

A

Pascal (Pa)

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8
Q

True or False: Pressure increases with depth in a fluid.

A

True

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9
Q

What is the formula for calculating pressure at a certain depth in a fluid?

A

Pressure = Density × Gravitational field strength × Height

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10
Q

What is the gravitational field strength on Earth?

A

Approximately 9.81 N/kg

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11
Q

Fill in the blank: The unit of pressure is equivalent to _____ N/m².

A

1

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12
Q

How does increasing the area affect pressure, assuming force is constant?

A

Pressure decreases.

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13
Q

What is the relationship between density and buoyancy?

A

An object will float if its density is less than the density of the fluid.

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14
Q

Fill in the blank: An object submerged in a fluid experiences an upward force known as _____ force.

A

buoyant

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15
Q

What is the principle that explains why ships float?

A

Archimedes’ principle

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16
Q

True or False: The pressure in a fluid is the same in all directions.

A

True

17
Q

What is the effect of temperature on the volume of a gas at constant pressure?

A

The volume increases as temperature increases (Charles’s Law).

18
Q

What does it mean if an object has a density greater than the fluid it is in?

A

It will sink.

19
Q

What is the relationship between pressure and volume for a gas at constant temperature?

A

Pressure increases as volume decreases (Boyle’s Law).

20
Q

Fill in the blank: The density of a substance can change with _____ and _____ conditions.

A

temperature, pressure

21
Q

What is a common application of understanding density in real life?

A

Determining whether an object will float or sink in water.

22
Q

True or False: A liquid’s density is usually greater than that of gases.

A

True

23
Q

What is the relationship between pressure and depth in a liquid?

A

Pressure increases with increasing depth.

24
Q

What does it mean for a fluid to be incompressible?

A

Its density does not change significantly with pressure.

25
Q

What is the formula for calculating the mass of an object if density and volume are known?

A

Mass = Density × Volume

Macedonia (7 decks)

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