Physics Flashcards
What is the formula for calculating density?
Density = Mass / Volume
True or False: Density is a scalar quantity.
True
What is the SI unit of density?
Kilograms per cubic meter (kg/m³)
Fill in the blank: The density of water is approximately _____ kg/m³.
1000
What happens to the density of a substance when it is heated?
It generally decreases.
What is pressure defined as?
Pressure = Force / Area
Which unit is commonly used for measuring pressure?
Pascal (Pa)
True or False: Pressure increases with depth in a fluid.
True
What is the formula for calculating pressure at a certain depth in a fluid?
Pressure = Density × Gravitational field strength × Height
What is the gravitational field strength on Earth?
Approximately 9.81 N/kg
Fill in the blank: The unit of pressure is equivalent to _____ N/m².
1
How does increasing the area affect pressure, assuming force is constant?
Pressure decreases.
What is the relationship between density and buoyancy?
An object will float if its density is less than the density of the fluid.
Fill in the blank: An object submerged in a fluid experiences an upward force known as _____ force.
buoyant
What is the principle that explains why ships float?
Archimedes’ principle
True or False: The pressure in a fluid is the same in all directions.
True
What is the effect of temperature on the volume of a gas at constant pressure?
The volume increases as temperature increases (Charles’s Law).
What does it mean if an object has a density greater than the fluid it is in?
It will sink.
What is the relationship between pressure and volume for a gas at constant temperature?
Pressure increases as volume decreases (Boyle’s Law).
Fill in the blank: The density of a substance can change with _____ and _____ conditions.
temperature, pressure
What is a common application of understanding density in real life?
Determining whether an object will float or sink in water.
True or False: A liquid’s density is usually greater than that of gases.
True
What is the relationship between pressure and depth in a liquid?
Pressure increases with increasing depth.
What does it mean for a fluid to be incompressible?
Its density does not change significantly with pressure.
What is the formula for calculating the mass of an object if density and volume are known?
Mass = Density × Volume
